A young suicide bomber in a school uniform attacked soldiers during morning exercises at a Pakistani army training camp today, killing 27 troops and wounding 40 others, police and the military said.
The attack in the north-west town of Mardan showed that despite years of army operations against their hideouts along Pakistan's border with Afghanistan, Taliban and al Qaida-linked fighters retain the ability to strike back.
It was one of the worst attacks on security forces in recent months.
Senior police official Abdullah Khan said 27 soldiers died and around 40 were wounded, some critically.
The army, which tends to release information much slower, put the death toll in an earlier statement at 20 and confirmed the general circumstances.
Despite his apparent disguise, the bomber's ability to get his explosives into the facility undetected signalled a failure on the part of the military.
Such army areas are usually heavily guarded, though an attack on the same training facility in 2006 killed 35 soldiers.
Troops quickly cordoned off the area and even police had a difficult time getting through.
No particular militant group immediately claimed responsibility, though the Pakistani Taliban has staged such attacks in the past.
The army has staged multiple offensives in Pakistan's north west aimed at taking out the Pakistani Taliban in recent years.
Its efforts against the group, which is distinct from but linked to the Afghan Taliban, appear to have been largely successful - but violence persists.
The US has encouraged Pakistan to eliminate the Pakistani Taliban in the belief that the long-term stability of the nuclear-armed Muslim nation is critical to global security.
Washington also wants Islamabad to take out militants who focus on fighting the US and Nato in Afghanistan but who have bases on Pakistani soil, in particular in the North Waziristan tribal region. But Pakistan has yet to mount an offensive in that area.Reuse content