Three paramilitary central reserve police force troopers and a local cop were among ten persons injured in a powerful grenade explosion in Srinagar [Images] on Saturday evening.

Police said militants attacked a patrol party of the CRPF with a powerful grenade at Habak road crossing on the strategic Srinagar Leh highway.

"When the road opening party of the CRPF were preparing to disengage for the day, militants hurled a grenade at them. The grenade exploded on the road, injuring three CRPF jawans, a local traffic cop besides six civilians," a senior police officer said.

"The injured have since been shifted to the Medical Institute in Soura," the official added.

Police and CRPF have cordoned off the area and mounted searches around the blast site.