Militants have launched a string of attacks on police in Lahore and northwest Pakistan, killing 39 people after a week of violence in which more than 100 people died.
An exchange of gunfire happened at an elite police academy in Lahore, capital of Punjab province, where two policemen have been killed.
The attacks in Lahore and a car bomb in Kohat come ahead of an expected military offensive against the Taliban in their South Waziristan stronghold on the Afghan border.
The violence, days after a daring raid on the army headquarters in Rawalpindi, underscored the risk posed by militants to Punjab.
Pakistan is under pressure from the US to crack down on militancy, as US President Barack Obama considers a huge boost in troop numbers fighting in neighbouring Afghanistan.
'There was an attack at three places', senior Lahore administration official Sajjad Bhutta told Dawn television.
'In two places, the situation is under control.'
Seven people were killed when gunmen attacked the regional headquarters of the police's Federal Investigation Agency in Lahore.
One of the dead was a gunman and at least four were police officials, police said.
A suicide car-bomber attacked the same FIA building in Lahore in March last year, killing 21 people.
Meanwhile, a suspected US drone aircraft fired two missiles at a house in the North Waziristan region on the Afghan border, killing four militants, Pakistani intelligence officials said.
The drone fired at a house 3km north of Miranshah, the main town in North Waziristan, and at least three Afghan Taliban members were among the four dead, the officials said.
