Sources informed that the first blast was of comparatively low intensity but the second explosion, which was carried out by a suicide bomber riding a motorcycle, caused heavy destruction.
"The explosion was so huge I will never forget it all my life. It was deafening, and then there was a cloud of dust and smoke. When the dust settled, I saw people crying for help and body parts scattered everywhere," media reports quoted one of the survivors as saying.
No terror group has taken the responsibility of the terror attack so far but intelligence reports suspected Pakistani Taliban's conspiracy behind the twin blasts.
However, sources also claimed that Pakistan came on the top terror radar list after US SEAL's special Abbotabad operation on al-Qaeda chief Osama bin Laden.