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