Islamabad, Pakistan (CNN) -- At least seven people died and 15 were wounded when a car bomb exploded in a tunnel in northwest Pakistan, police said Saturday. The blast occurred late Friday, said Kazi Hamid, a Kohat city police officer. It was in the Kohat Tunnel, a thoroughfare to metropolitan cities such as Karachi. Kohat is in Khyber Pakhtunkhwa province, which borders Afghanistan. From journalist Nosheen Abbas .
The blast took place in a thoroughfare to cities such as Karachi . A police officer says a bomb was planted in a car .