Security forces stand at the site of a bomb attack in Shangla district October 12, 2009. [Agencies]

LAHORE, Pakistan: Gunmen attacked police offices in the Pakistani city of Lahore on Thursday and a car bomb exploded outside another in the northwest, killing at least 15 people after a week of violence in which more than 100 people died.

The attacks in Lahore in Pakistan's heartland province of Punjab and in Kohat in the northwest followed a pattern of destabilising assaults, including the storming of army headquarters, ahead of an impending military offensive against the Taliban in their south Waziristan stronghold.

One of the dead was a gunmen, a police official told reporters, adding that the building had been cleared of attackers.

Gunmen also attacked a police training centre in Lahore but there was no word on casualties. Media had unconfirmed reports of a third attack in the city.

A suicide car-bomber attacked the same FIA building in Lahore in March last year killing 21 people.

Shortly before the attacks in Lahore, a suicide car bomber set off his explosives outside a police station in Kohat killing 10 people, police and military officials said.

"Some school children are among the dead," a policeman at the scene said.

Pakistan's government has said a ground offensive against an estimated 10,000 hard core Taliban is imminent in South Waziristan.

The government says most attacks in the country -- including four major ones since October 5 that killed more than 100 people -- are plotted in South Waziristan on the Afghan border.