In a city where most police do not carry guns, the shooting death of a suspect on a crowded London subway has resonated much further than the underground station where the incident occurred.

Across the British capital Saturday, residents learned more about the suspect police officers chased onto a subway car Friday and shot to death five times at point-blank range.

In a statement, London police said the man was not connected to Thursday's attempted bombings on the British capital's transit system, and called the killing 'regrettable' and a 'tragedy.'

Experts say the shooting death raises questions about police firearm practices and deepens the anxiety of a city that increasingly feels under siege.

Some information for this report provided by AP, AFP and Reuters.