A gunman who tried to rob a bookmaker in England has died after he was tackled by unarmed customers, police said.

Broadcaster ITV News reported that the man, in his 50s, went into a branch of bookmaker Ladbrokes just before 7 p.m. local time (2 p.m. ET) in Plymouth, England.

Customers disarmed him and held him on the floor, police told the station, and he was unconscious when officers arrived. He was declared dead shortly after.

In a statement, a spokesman for Devon and Cornwall Police told ITV News that “it quickly became clear the man was unresponsive and an ambulance was immediately requested by police who carried out CPR until they arrived.”

“A few minutes later, three paramedics arrived at the scene and continued to carry out further CPR. Around 20 minutes later the man was declared dead at the scene by the paramedics,” the statement added.

Ladbrokes declined to comment, ITV News said.

ITV News is the U.K. partner of NBC News.