A suicide bomber on a motorcycle has killed at least 80 people at a paramilitary force academy in northwest Pakistan.
This is the first major attack since Osama bin Laden was killed in the country.
Pakistani Taliban militants have claimed responsibility to avenge Bin Laden's death.
More than 140 people were injured in the deadliest attack in the country this year.
The explosions detonated in northwest Pakistan as newly-trained paramilitary cadets wearing civilian clothes were getting into buses and coaches for a ten-day leave period after a training course.
The bombers blew themselves up outside a police training centre in Shabqadar town, about 30km north of Peshawar in the northwest region where Taliban and al-Qaeda-linked militants repeatedly attack security forces.
Police officials confirmed that at least 70 people had been killed, making it the deadliest attack in Pakistan since 5 November when a suicide bomber killed 68 people at a mosque in the northwest area of Darra Adam Khel.
20 shops and 12 vehicles were destroyed in the intensity of the blasts.
The Pakistani Taliban last week threatened to attack security forces to avenge Bin Laden's killing in a US helicopter raid north of the capital Islamabad.
There has been little public protest in support of Bin Laden in a country where more people have been killed in bomb attacks in the past four years than the nearly 3,000 who died in al-Qaeda's 11 September, 2001 attacks.
But under growing domestic pressure to punish Washington for the Bin Laden raid, Pakistan's civilian government said yesterday it would review counter-terrorism cooperation with the US.
