Rawalpindi, Sept 22 : A lone suicide bomber carried out the deadly explosion at the Marriott hotel on Saturday killing 60 persons and injuring more than 200, said a report submitted to the prime minister by a joint investigation team.
The investigation team, comprising of experts of the Special Investigation Group and intelligence personnel was headed by Federal Investigation Agency Director General Tariq Perveez. The team visited the blast site after midnight and collected evidences, including a CCTV footage.
The report suggested that 600 kgs of high-intensity explosive material, RDX and TNT, were used in the attack.
A bomb disposal expert said the attacker might have used "delay switches" which detonate explosives at intervals.