KARACHI - Jamaat-e-Islami (JI) chief Munawar Hassan on Sunday claimed that Blackwater and US marines were involved in the Data Darbar blast saying that any Muslim cannot imagine the act of terrorism at Data Darbar. Addressing press conference at JI office Idara-e-Noor Haq, he said that Blackwater and US marines wanted to destabilise Pakistan. Commenting over the statement of Federal Interior Minister Rehman Malik, he asked the Federal Minister to arrest the terrorists involved in the attack on Data Darbar incident. He underlined the need of Jirga politics to resolve the ongoing issues of FATA areas and asked the government to reject the pressure of operation on Southern Punjab and North Waziristan. He said that Army chief did not presented the balance sheet of Army operation in Southern Waziristan and asked the Chief of Army Staff to inform the nation about the achievement of Pakistan Army to stop the acts of terrorism through operation.