RAF Waddington 'unexploded bomb' was WW2 practice shell
An "unexploded bomb" discovered at an RAF base in Lincolnshire was a World War Two practice shell, officials said.
The device was discovered by contractors working on runway improvements at RAF Waddington, near Lincoln.
A spokesman said the ordnance turned out to be an 11.5lb (5.2kg) practice bomb, which has now been removed.
The A15 between Lincoln and Sleaford was closed while bomb disposal teams dealt with the device.
Waddington is home to the RAF's first squadron of armed drone aircraft to be operated remotely from the UK.
More than £35m is currently being spent rebuilding and lengthening the runway at the base.