Children in west Belfast picked up an unexploded bomb outside a police station on Monday night.
It was one of two devices thrown at the back of the Woodbourne station, one of which exploded.
Afterwards, children carried the other bomb to the front of the station.
''People in Suffolk estate ... saw a group of young children ... come round the side of the police station carrying an object,'' said Councillor Brian Kingston, who spoke to residents later.
"They placed an object on the ground and scarpered along Stewartstown Road and up Suffolk Road.
The BBC reports the explosion happened about 10.30pm (BST) and the second bomb was found at about 11pm. It was made safe by the Army.