A well-organised \"terror gang\" is believed to be behind an armed assault on a Nairobi shopping mall, senior police sources told AFP, adding they had also detained one wounded suspect. \"This cannot be a normal robbery because all the survivors are saying how the group confronted them and opened fire,\" a senior police official told AFP on condition he not be named. \"We have reports there were up to 10 or so attackers and they appeared to be wearing a similar outfit, and others covered their faces,\" another police official said. \"The pattern of the attack and the way they were speaking to their targets clearly point to a well-planned attack by a terror gang.\"