A masked gunman has died after being pinned down and restrained by customers during an armed robbery at a bookmakers in Plymouth, police have said.
The man, in his 50s, entered the Ladbrokes branch in Crownhill Road at 18:45 GMT wearing a gas mask and holding a pistol.
Customers disarmed the man and held him on the floor, police said.
Police arrested the man, who was already unconscious, upon arrival but he died a short time later.
The man has been identified but next of kin have not yet been informed, a spokesman for Devon and Cornwall Police said.
The spokesman said when the man entered the shop, he was "immediately tackled" by customers and "held down still wearing his gas mask".
When officers arrived, they attempted to resuscitate the man until paramedics arrived but he was declared dead about 20 minutes later.
The police watchdog, the Independent Police Complaints Commission (IPCC), has been informed.
Ch Insp Ian Drummond-Smith said: "This is a very serious incident. We cannot speculate on what has actually taken place here today.
"A full investigation has now begun and while the IPCC carry out their investigation it is not appropriate to comment further."
Ladbrokes declined to comment.