Three men carried out 27 “highly dangerous” attacks on cash machines in West London, Surrey and the Thames Valley since July 2014.
The cash machines were exploded to get to the contents – police say members of the public were lucky not to be killed or injured by the explosions.
In eight of the successful attempts the gang made it away with £356,330. The damage they caused is said to be more than £320,000.
“It was sheer luck that nobody was killed due to the actions of this gang,” says Detective Inspector Scott Hartley of the Flying Squad.
“They handled an extremely dangerous substance carelessly and with complete disregard for the safety of others.
“Given that this series of crimes involved 27 offences, it is fortunate that no unsuspecting members of the public were injured.
“If this debris had struck a member of the public or a passing car the resulting injuries could easily have been fatal.”