Two young British pals machine-gunned to death in Florida were lured to the murder scene after a boozy night out, police fear.

Detectives are working on the theory that holidaymakers James Cooper and James "Jam" Kouzaris accepted a lift from a stranger.
They suspect the driver then drove the two friends to a crime-ridden ghetto, where masked thugs were lying in wait to rob them.
James and Jam, both 25, died in a hail of sub-machine gun bullets as they fled in terror. A boy of 16 is in custody over the 3am murders and police say there could be more arrests.
The local newspaper reported that police had found "dozens" of spent shell casings at the scene.
James was a tennis coach who played against Andy Murray as a youngster. Jam was an experienced world traveller who had spent months touring South America.
Both lads died in a rundown part of Sarasota, Florida, notorious for gang violence and drug crime.
The dangerous Newtown area is miles from the posh Gulf Coast holiday resort where the boys were staying. It has the city's worst crime rate and tourists hardly ever go there.
Police captain Paul Sutton said: "It is very unusual to find visitors in this area. It's a residential neighbourhood with no shops and no bars."
James and Jam had been out drinking in the bars of downtown Sarasota. They had no car, there is no public transport at that time of night and the police have found no record of the boys taking a taxi.
That seems to leave only one possibility - that someone drove them to the narrow one-way street where they were killed.
A police source said: "It is entirely plausible that they were taken to this location, where they were confronted by at least one individual.