RAWALPINDI, Pakistan: Militants hurled hand grenades then fired on a mosque near Pakistan's military headquarters after Friday prayers, killing at least 39 people, rescue services said.
Pakistan is fighting Taliban fighters blamed for bombings that have killed hundreds of people since an offensive was launched on their stronghold South Waziristan in October.
It faces mounting US pressure to root out Islamist militants operating along border areas to help in the war against the Taliban in Afghanistan.
"The mosque was attacked by terrorists during Friday prayers. There was more than one attacker, for sure...," said military spokesman Major General Athar Abbas.
"As I said there were certainly more than one attacker, so there is a possibility that some of them may still be hiding in the vicinity."
The violence will press President Asif Ali Zardari to ease the threat from the Taliban insurgency.
In October, suspected Taliban gunmen wearing army uniforms attacked the army headquarters, killing three hostages and two army commandos.