Advisor to Prime Minister for Interior Rehman Malik Sunday confirmed that 53 people were killed and 266 others wounded in the Islamabad bomb blast. Briefing the media here, Rehman Malik said 600 kilogrammes of TNT and RTX explosives were used in the attack, which he termed the as largest blast in Pakistan, but denied that there was a security lapse. He said the attack was a well-planned action to sabotage the economy and the country's progress.