Unknown criminals hurled a bomb at a police outpost under Khan Jahan Ali Police Station around midnight Wednesday in the Khulna city.

The fourteen policemen staying at the Shiromoni police outpost at that time escaped injury. Police sources said the bomb struck the sunshade of a ground-floor window.

The sentry on duty at the gate was alleged to have dozed off when the bomber took the advantage of darkness during a power cut. Bewildered policemen fired some shots in the air and cordoning the area off but failed to arrest anyone.

It may be mentioned that three hours before this incident a bomb was hurled at an Awami League (AL) leader in front of the AL party office at Phulbari Ghat in the city under the same police station.