At least two police personnel were killed and two were injured in a hand grenade blast in Karachi, Aaj News reported on Wednesday.

The condition of the two injured policemen is critical, the police said. The blast occurred at the ammunition depot of Garden police headquarters.

As per reports, one of the deceased personnel was carrying the hand grenade when it exploded.

The two martyred cops have been identified as constable Shehzad and police cobbler Sabir.