Islamabad: Security forces have arrested an Al Qaida-linked militant in connection with an assassination attempt on Benazir Bhutto hours after she returned from exile in October.

Bhutto survived the suicide bombing on a procession in Karachi after she arrived home on October 18, but nearly other 140 people were killed.

Bhutto was assassinated in a gun and bomb attack blamed on Al Qaida-linked militants in Rawalpindi on December 27.

Interior Minister Hamid Nawaz said the suspect, Qari Saifullah Akhtar, was arrested early yesterday, along with his three sons.

"He was involved in the Karsaz bomb blast," he said, referring to an overpass in Karachi where the attack on Bhutto took place.