Unidentified gunmen fired at a police check post in the Pakistani capital on Thursday, injuring a security personnel.
The attackers were armed with Kalashnikovs, authorities said, adding that one policeman was injured in the incident and admitted to hospital.
Police later launched a search for the gunmen.
Separately, up to four armed men knocked a security personnel unconscious and snatched his official car.
The car belonged to a security organisation.
The attackers had tied up the driver, who alerted authorities about the incident when he gained consciousness in hospital three hours later.