LONDON -- Hours after the opening ceremony fireworks echoed around east London, up to 400 demonstrators marched through a neighborhood near the Olympic Park to protest what they called the "Corporate Olympics."

The event, organized by Counter-Olympic Network and supported by 35 groups ranging from Occupy London to ecological and local anti-austerity campaigners, targeted issues including free tickets for sponsors, missile sites on residential blocks and the ethics of Olympic corporations such as BP and Dow Chemical.

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“A significant number of people in this country -- about 20 percent, according to a poll -- are not happy with the Olympics because of the involvement of large corporations about which are significant concerns,” said Julian Cheyne of the Counter-Olympic Network. “We are representing their views and making sure that opinion is expressed.

“It is shameful that BP is a sustainability partner of the Olympics after the damage it did to the Gulf coast with their spill, and Dow Chemicals are not meeting their moral and ethical obligations to help the victims of the Bhopal disaster.”

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The Saturday lunchtime event passed without incident, in contrast to Friday night’s Critical Mass protest –- against the temporary closure of cycle lanes to make way for VIP Games traffic -- that saw 130 arrests.

It coincided with a visit by the Queen to the athletes' village and the swimming arena, and came only 12 hours after the spectacular opening ceremony watched by billions across the world. The protest was significantly smaller than organizers' original estimates of up to 5,000, and at one stage was almost outnumbered by news reporters and camera crews.

Protesters, flanked by large numbers of police motorbikes, began in Mile End and went past the Bow Quarter apartment building whose roof tower is one of six sites around London where the military have installed Rapier missile launchers as part of London’s $877 million security operation protecting the Games.

“This is the heaviest militarization of London since the Second World War,” Cheyne said.

One protest banner read: “International games OK. No to Corporate backed destruction of people’s homes, green space, livelihoods, human rights.”

As protesters shouted slogans outside Bow Quarter, soldiers guarding the missile launcher stared back from their temporary lookout position at the top of the tower.

As it went along Bow Road, the march was blocked by a small group of local residents who brandished an Olympic flag and chanted back: “Up the Olympics!”

Diane Grieves, who lives on the street, said: “I’m delighted about the Olympics -- it’s really helped the area and brought everyone together. If there weren’t corporate sponsors then the Olympics would be even more expensive for taxpayers.”

Protester George Barda shouted “No to the corporate Olympics” while wearing a T-shirt highlighting the victims of the 1984 disaster at Bhopal chemical plant of the Union Carbide Company, which merged with Olympic sponsor Dow Chemical in 2001.

He was also wearing a pair of shoes and a backpack from Olympic sponsors Adidas.

“I’m just wearing these shoes out because I have nothing else left,” he explained to NBCNews.com. “I know I’m part of the problem for buying the products but the bigger issue here, which is much more important, is that the Olympics has been taken over by unethical corporate sponsors despite the fact that they only contribute five per cent of the cost of the Games.”

Among the others taking part was Dana Wojokh, from New Jersey, who was highlighting the plight of Circassians -- a Caucasian and Middle-Eastern mountain tribe that was the victim of genocide by imperial Russia at the end of the 19th century centered on Sochi, where Russia intends to host the 2014 Winter Olympics.

“This is our chance to tell the world what happened to Circassians -- oppression that is still happening, for example in Syria,” she said.

A spokesman for the London Organizing Committee of the Olympic and Paralympic Games told BBC News: “The Olympic Games is the biggest event in the world, and big events have always been a magnet for protests of all shapes and sizes; we have planned for this.

"We implore any protesters to consider the impact of any action on the athletes, most of whom have spent half their lives preparing for London 2012.

"We are a sport-loving nation, and ruining sporting events is not the way anyone wants London 2012 to be remembered."

More London 2012 coverage:

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• London's 'East End': From haven for gangsters to Olympic showcase
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• Bad neighbors for Team USA? Occupy camp faces ax
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Nigerian villagers say oil washing up on the coast comes from a Royal Dutch Shell loading accident last month that caused the biggest spill in Africa's top producer in more than 13 years.

Shell denies that any of the oil is from its 200,000 barrel per day Bonga facility, 120 km offshore and accounting for 10 percent of monthly oil flows, which was shut down by the spill on Dec. 20.

Shell says five ships were used to disperse and contain the spill and that this kept any oil from washing ashore.

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But local villagers, as well as environmental and rights groups, dispute this account, saying the oil is still at large, coating parts of the coast, killing fish and sparking protests.

On Saturday, a Reuters team visited two of 13 villages whose residents say they were affected by the spill in the steamy swamps of the Niger Delta. In both, there were stretches of beach coated in a film of black sludge with a rainbow tint.

In one, two children skipped along the beach, dodging the puddles of sticky ooze.

Villagers in Orobiri, Delta state, spent much of the day scooping crude from the water in plastic buckets and jerrycans.

"When this spill occurred, we called on Shell to come and do a clean up, ... but since then, they have not turned up, so we the communities now did a clean-up instead," said Jacob Ajuju, the paramount chief of Orobiri village, surrounded by rows of assorted buckets and containers full of crude.

As he spoke, dozens of women villagers marched in protest at the spill, their heads adorned with leafy branches to symbolise unhappiness. Others continued to tip the oil from jerrycans into large plastic drums.

"On Christmas day, all the women you see here, were just at the seaside parking this oil into the jerrycans," said Dennis Igolobuabe, Orobiri community youth president.

Shell says no oil from the spill washed up on the coast.

"We believe the oil on the beach is not from Bonga. We made significant progress every day to disperse the oil that leaked from Bonga," Shell Nigeria spokesman Precious Okolobo told Reuters in an emailed statement.

"We are confident that any oil of that age, colour and consistency that hits the beach is not ours. We are taking samples ... which will be reviewed to provide evidence that this is not Bonga oil on the beach," he added.

Okolobo suggested the oil may have been from "a third party spill which appeared to be from a vessel, in the middle of an area that we had previously cleaned up".

Spills by all oil companies operating in the region are common, and it is sometimes hard to tell whose is whose.

On another beach near Agga village, a man on a motorbike paused to look at scores of silvery fish washed up dead.

"Before this spill came, we were already been informed by Shell in Warri (the main town in the region) during a meeting that this is what is coming ... It's a calamity," said Joseph Gbuebo, community secretary for Agga.

"On the 25th of this month, we saw some helicopters flying, dropping some chemicals along the shore, but this has been injurious to our health," he added.

Shell's pipelines in Nigeria's onshore Niger delta have spilled several times. The company usually blames such leaks on sabotage attacks and rampant oil theft.

BP's Macondo well in the Gulf of Mexico ruptured in April last year, spewing nearly 5 million barrels of oil into the sea in what was the worst U.S. marine oil spill. The disaster brought intense negative publicity for BP.

But in Nigera, spills are so commonplace they often go unnoticed by the outside world.

A U.N. report in August criticised Shell and the Nigerian government for contributing to 50 years of pollution in a Niger Delta region that it said needs the world's largest oil clean-up, costing an initial $1 billion and taking up to 30 years.

Separately, the cost of fuel more than doubled in Nigeria a day after the government announced an end to fuel subsidies.

Sign posts at a few gas stations Monday morning put the price at nearly $3.60 per gallon (94 cents per liter), up from about $1.70 per gallon (45 cents per liter) on Sunday.

Many more stations were shut down, while bus and taxi fares had already risen.

The subsidy was one of citizens' few government benefits in the oil-rich nation, and its removal follows the government's Saturday declaration of a state of emergency in some parts of the nation over a growing Islamist insurgency.

Nigeria produces over 2 million barrels per day of crude oil but a lack of investment in refineries and infrastructure means almost all of this is exported, while refined products such as petrol have to be imported at great cost.

Labor unions, who ironically described the holiday move as the president's New Year "gift" to Nigerians, vowed they would fight it.

Reuters and the Associated Press contributed to this report.