KOHAT: Unknown terrorists hurled a grenade on a police station at the old toll plaza of Kohat Friendship Tunnel late on Thursday night.

However, the grenade could not explode.

The police said the grenade was hurled f rom a van, but luckily it did not explode. They said the vehicle sped away towards Peshawar.

They said an operation was launched in the area to arrest the terrorists.

The Counter-Terrorism Department has registered an FIR and started investigations.

It is to mention here that 13 policemen have been injured in attacks carried outinKohatin recent days.