woman, arrived in dubai the day before the killing. five of them carried out the crime while the other six served as lookouts. their every move was caught on security cameras. it's fascinating footage. the question is who are the alleged killers and who ordered the hit. paula hancock investigates. >> reporter: minute by minute, this is the lead-up to the dubai assassination of one of the founding members of hamas. all captured on security cameras and released by the emirates police. ten men and one woman. the alleged hit squad. some check into the al bustan rotana hotel. they await their target. this is nabhouh arriving at the hotel, where he would be killed just hours later. after checking in, the man israeli security sources accuse of being a key link between iran, hezbollah and hamas was followed by two alleged killers dressed in tennis gear holding tennis rackets. the police say they were checking the number of his room, then they booked the room directly across the corridor.