Pakistani Taliban militants have said they carried out the attacks, according to Reuters news agency.
"It's the first revenge for the martyrdom of... bin Laden. There will be more," Taliban spokesman Ehsanullah Ehsan said by telephone from an undisclosed location.
The atrocity has been condemned by Pakistani President Asif Ali Zardari and British Foreign Secretary William Hague.
It was the bloodiest attack in the country since a US raid killed al Qaeda chief Osama bin Laden earlier this month.
Police officer Liaqat Ali Khan said 66 of the victims were recruits for the Frontier Corps, who were about to be bussed home from the centre. Read More