At least seven persons including the policemen and recruits were injured in a blast in Pakistan’s Karachi near Khawaja Ajmernagri police headquarters on Sunday. SSP Salman Hussain said that Khawaja Ajmernagri police headquarter was targeted by the miscreants, Pakistan’s Geo TV reported. DSP Sher Muhammad said that two motorcycle riders targeted the headquarter with hand grenade, as a pin of the hand grenade was found near the place of incident. Four policemen were performing their duty at the gate of the headquarter. Among the injured the condition of two policemen are serious, police said. The entire area surrounding the police headquarter has been cordoned off and strong contingents of Rangers and police have been posted.