The Pakistani army has regained control of a police academy in Lahore after gunmen killed at least 20 people in an attack on the facility.
Interior Ministry Secretary Kamal Shah said 89 policemen were wounded in the attack, which saw the gunmen holed up inside the academy for hours, but the number killed was still being ascertained.
'The operation is over. Four terrorists were killed and three arrested,' Mr Shah said.
Punjab Governor Salman Taseer said authorities have reports of four people confirmed killed, although television news channels put the number of dead at 20.
One wounded policeman said the attackers struck while police recruits were going through their regular morning drill on the parade ground.
'A grenade hit the platoon next to ours ... then there was continuous firing for about 20 minutes,' the policeman said.
'A man in light-coloured clothes - I think they were white - stood in front of us, firing at us. They wanted to do as much damage as possible.'
Army and paramilitary troops fired from rooftops of surrounding buildings, while the gunmen returned fire and threw grenades to keep police at bay.
News channels showed police detaining a suspected attacker.
Footage showed police detaining the bearded man before leading him through a throng of journalists.
Reports said he was caught with a grenade in his possession.
Governor Taseer said up to ten gunmen carried out the assault, although one wounded policeman said there were up to 20 gunmen in the building.
It is unclear if any police are being held hostage.
The training centre is on the outskirts of the city, on the road to the nearby border with India.
The assault came less than a month after gunmen attacked Sri Lanka's cricket team in Lahore, killing six police guards and a bus driver.
'It's a continuation of the series of attacks carried out by the terrorists,' Mr Taseer told journalists, adding a curfew has been imposed in the area.
Senior police official Azhar Nadeem said authorities were taken by surprise.
'It was a surprise attack and the initiative was in their hand. Police are reacting to that, and I hope that this stand-off will end soon,' Mr Nadeem said.
