Peshawar, Jan 29 (Agencies): At least eight were killed and 14 injured in twin truck bombings in northwest Pakistan on Saturday. Militants attacked a strategic tunnel with two explosives laden trucks, officials said.

The Japanese-built Kohat tunnel, which links Khyber-Pakhtunkhwa capital Peshawar to southern parts of the province, was first targeted with an explosives-laden truck that entered the structure and blew up, police officials said.

In the second attack, an oil tanker packed with explosives hit a check post manned by army and paramilitary personnel outside the tunnel.

The check post was empty but the blast hit a van that was behind the tanker, officials said.

Two women were among the eight persons who died in the attacks.

Four persons who sustained serious injuries were taken to Peshawar while the others were admitted to hospitals in Kohat.

Several cars in the tunnel were damaged by the first blast, in which 500 kg of explosives was used.

The tunnel was closed after the attacks and security forces cordoned off the area.

Pro-Taliban militants had captured the tunnel on the Indus Highway in early 2008.  Security forces had then launched a major operation to flush out militants from the nearby Darra Adam Khel region.