Updated at 7:01 a.m. ET: A passenger jet flying from New York to Moscow made an emergency landing in Iceland on Thursday after a caller claimed there was a bomb on board, a spokeswoman for Russian airline Aeroflot said.

Fridthor Eydal, the manager at Reykjavik's Keflavik International Airport, told NBC News the Airbus A330 with 253 passengers on board landed safely at 6:27 a.m. (2:27 a.m. ET) and the plane had been evacuated.

"There was an anonymous call saying that there was an explosive device on the plane, which was already in the air," spokesman Irina Dannenberg said.

The call was made to the New York City police, Dannenberg told the ITAR-Tass news agency.

Passengers were going through standard security procedures on the ground in Reykjavik and would later be transported to a nearby hotel, local police told NBC News.

Police planned to search the aircraft later Thursday, authorities said.

Second plane searched
Emergency teams also searched an airplane in the city of Voronezh, 300 miles south of Moscow, for explosives on Thursday after an anonymous phone call was made to the city's airport, but no bomb was found, state-run RIA reported.

Complete World coverage on NBCNews.com

A suicide bomb blast in the international arrivals area at Moscow's Domodedovo airport in January 2011 killed 37 people. Islamist insurgents in Russia's North Caucasus claimed responsibility.

Suicide bombers identified as women from the North Caucasus blew up two planes on domestic Russian flights nearly simultaneously in August 2004, killing all 90 people aboard.

NBC News' staff, Reuters and The Associated Press contributed to this report.

More world stories from NBC News:

• Report: 30 dead in Syrian air strike; strife spills into Lebanon
• I'd like a beer, 70-year-old says after icy 6-day ordeal in Alps
• Germany arrests 4 suspected of violating Iran embargo
• Study: Japan nuclear disaster caused mutated butterflies
• Restaurateur claims Games cost her business $140,000
• Video: Virtual tour of the next Olympic city

Follow World News from NBCNews.com on Twitter and Facebook

Updated at 6:22 p.m. ET: LONDON -- An 11-year-old boy flew alone from England to Rome after boarding a commercial flight without a passport, boarding pass or cash, officials said Wednesday.

Several members of staff at Manchester International Airport and with discount air carrier Jet2.com have been suspended and an inquiry has been launched in the wake of the incident during the height of the summer travel season, officials told NBC News.

The boy is now back home with his family and the airport is treating it as "a very serious incident," an airport spokesperson told NBC News by telephone.

Punning on the popular "Home Alone" movies starring Macaulay Culkin in the 1990s, British newspapers are calling it the "Rome alone" incident.

The case of the stowaway boy comes as international travelers pour into Britain just two days before the opening ceremonies of the Summer Olympics in London, less than 200 miles to the southeast.

"I treat security breaches very, very seriously indeed, so we are now reviewing urgently with Manchester Airport, and indeed the airline, exactly what happened," British Transport Secretary Justine Greening told the BBC.

Five security checks
The boy, who was named in local media reports as Liam Corcoran, managed to pass through five security checks by tagging along with another family before boarding the plane, according to reports.

The plane's captain was notified that his flight had an extra passenger after the aircraft was already in flight, the Manchester Evening News reported. Airplane staff kept the boy onboard after landing at Rome’s Fiumicino Airport and he stayed on the plane until it returned to Manchester later Tuesday.

More London 2012 coverage from NBCNews.com

"This extremely serious matter is now being urgently investigated by officials from the airport and airline. It is clear that documentation has not been checked correctly at security and the boarding gate. The boy went through full security screening so the safety of passengers and the aircraft was never compromised. We made preparations to ensure that his return to the U.K. was handled sensitively to avoid any distress," the airport said in a statement sent to NBC News.

The flight from Manchester to Rome is approximately 1,500 miles.

Fortress London: UK protects Olympics with biggest security plan since World War II

The boy did not pose a security risk because he passed through all of the proper security procedures, the airport spokesperson and the airline told NBC.

"We have launched a full investigation into what is a serious incident, and the staff involved have been suspended pending the outcome. The boy has been returned safely to his family," a spokesperson from Jet2.com said in a statement given to NBC News.

Full international coverage from NBCNews.com

'He seemed ... quite unfazed'
The boy had disappeared just after noon Tuesday during a trip with his mother to a shopping center in Wythenshawe, on the south side of Manchester, before making his way to the airport, a Manchester police spokesperson told NBC News. Local reports said the boy wanted to run away from home.

"He was very talkative and seemed quite unfazed by it all. He was just sat there chatting away about how he'd been trying to run away from home," airplane passenger Sarah Swayne, 26, from Nantwich, England, told the Evening News.

More coverage on this story from NBC's British partner ITV News

"He seemed quite innocent really and I don't think it had sunk in how serious the situation was," she told the newspaper.

"When the plane touched down, he clearly didn't want to get off but he was taken down the steps before everyone else and met at the bottom by a group of staff who quickly whisked him away," another passenger, who did not provide a name, told the Evening News.

More world stories from NBC News:

• Olympic security plan turns London into fortress
• Spain teeters on the edge of a steep 'fiscal cliff'
• Going for gold: British workers cash in on Olympics with strike threats
• Ice melt found across 97 percent of Greenland, satellites show
• Afghan police commander leads defection to Taliban
• This family's Olympic odyssey includes bikes, satellite dish, reindeer pelts
• In Kenya, cell phones can do everything

Follow World News on NBCNews.com on Twitter and Facebook

An American on a flight from Dubai to Seattle suffered a heart attack and was taken to Iran for treatment, according to reports Saturday.

The AFP news agency, citing Iran’s ISNA service, said the Emirates aircraft was in Iranian airspace when the passenger, 52, became unwell and the plane landed in Tehran.

“Yesterday (Friday), an airplane belonging to the Emirates airline, flying from Dubai to Seattle and while passing over Iran’s airspace, contacted the control tower and announced that one of this flight’s passengers had suffered a heart attack,” Abbas Mosayebi, of Iran’s Civil Aviation Organization, was quoted as saying.

“Despite international sanctions against the Iranian people which also endanger their lives, yesterday we helped an American citizen in our country,” Mosayebi reportedly said, adding the man was still in a hospital Saturday.

Iran, world powers begin talks over its nuke program

AFP said Swiss diplomats in Tehran, who handle American interests in the absence of a U.S. Embassy, declined to comment on the report.

The incident comes and the U.S. and other world powers are holding talks with Iran over its disputed nuclear program.

More from msnbc.com and NBC News:

Failed rocket launch? What rocket launch?

Brazil's 'gringo' problem: its borders

Can the 'Toulouse effect' save Sarkozy from defeat in France?

Nun at center of Spain's stolen babies scandal refuses to testify

Follow us on Twitter: @msnbc_world

A Delta Air Lines flight from Atlanta to Costa Rica was diverted to Tampa, Fla., on Sunday evening after a couple from Germany became unruly, officials said.

Delta spokeswoman Chris Kelly Singley told The Associated Press Flight 414 departed Hartsfield-Jackson Atlanta International Airport at 6 p.m. Sunday and landed at Tampa International Airport at 7:34 p.m. The captain made the call to land, the spokeswoman said. After the "unruly" passengers were removed, the plane went on to Costa Rica, she said.

Tampa International Airport spokeswoman Janet Zink identified the passengers as Peter and Gabriele Strohmaier of Dusseldorf, Germany. She said they were seated in first class and demanding food and Champagne and refused to sit down.

Zink said no charges had been filled. The FBI and Transportation Security Administration were investigating.

Reached at the Tampa hotel where the couple was spending Sunday night, Gabriele Strohmaier told The Associated Press that a Delta crew member "exaggerated enormously and felt terribly insulted" after her husband raised concerns about the food and beverage service.

She said her husband had asked for a glass of champagne, but was told it was all gone. She said the crew member then walked away rather than listen to his concerns. She denied that she or her husband was told to sit down and refused.

"No, we were not standing," she said.

Peter Strohmaier, who identified himself as a lawyer, said he "did nothing except to say I would like to have the meal and so on...all normal things."

He said the Delta crew member told him she was not pleased with his attitude.

"I am not prepared to accept such behavior," he said, adding that in the end he didn't get Champagne, a meal or even water. The couple had flown to the U.S. from Germany earlier in the day.

Gabriele Strohmaier said the couple need to "take another airline, naturally not Delta" to get to Costa Rica.

The Tampa Bay Times reported that flight 413 was on the ground for about an hour before continuing on to Costa Rica.

More content from msnbc.com and NBC News:

• Huntsman to drop out of GOP race
• New round of snow likely for Midwest, Northeast
• Trend against outsourcing brings jobs back from China
• 45 years later, a special ring finds its way home

The Associated Press and msnbc.com staff contributed to this report.