A blast was heard in Pakistan's North West Frontier Province (NWFP) on Monday night and a policeman was injured, according to private DAWN NEWS TV channel.
The blast reportedly occurred near a police station in Mingora in Swat valley of NWFP.
The Pakistani Government on Monday put a Taliban group called Tehrik-e-Taliban Pakistan (TTP) on banned list.
Pakistan lately witnesses a series of suicide attacks and more than 100 people were killed. The TTP claimed responsibility for the attacks and threatened to carry out more attacks.