The attackers had planned the attack several months ahead of time and knew some areas well enough to vanish and reappear after security forces had left . Several sources have quoted Kasab telling the police that the group received help from Mumbai residents . The attackers used at least three SIM cards purchased on the Indian side of the border with Bangladesh . There were also reports of a SIM card purchased in the US state New Jersey , if this is the case , then this would go back to Iraqi Intelligence Services and Al Qaeda from 9/11 or Jemmah Ismaliyah and Egyptian Islamic Jihad through Iraqi Intelligence from Saddam Hussein 's old network of militants that was never proved . Police had also mentioned that Faheem Ansari , an Indian Lashkar operative who had been arrested in February 2008 , had scouted the Mumbai targets for the November attacks . Later , the police arrested two Indian suspects , Mikhtar Ahmad , who is from Srinagar in Kashmir , and Tausif Rehman , a resident of Kolkata . They supplied the SIM cards , one in Calcutta , and the other in New Delhi
9/11
September 11 attacks
2008 Mumbai attacks