Police have condemned arsonists who put a speed camera on one of Northamptonshire's most hazardous roads out of action.
The explosion sent shards of metal flying 50 feet
The device at Thorpe Waterville on the A605 was severely damaged.
Police said 29 people have been killed or seriously injured on the stretch between Thrapston and Oundle in the last three years.
A speed camera at Thrapston was destroyed by a bomb in February this year.
The blast sent shards of metal flying more than 50 feet.
Anyone with information is asked to call Northamptonshire Police