Two motorcycle-borne assailants shot dead a policeman today when they were asked to stop at a check post in the Pakistani capital.
Two men on a motorbike were signalled to stop by the policemen manning a check post but instead they opened fire.
"One police officer was killed and two others were injured in the attack," police spokesman Zia-ul-Qamar said.
The incident sparked panic and police launched a search for the attackers.
It was second major incident in Islamabad in the day after a former provincial governor of Afghanistan was kidnapped.
Security has already been put on alert in the capital as police has set up check posts on all main entry routes coming into Islamabad.
Paramilitary Rangers are also regularly patrolling the city.
