At least 12 people were detained on Friday for questioning in connection with the deadly ambush of five army soldiers in the dense forest area of Bata Doriya here even as a MI helicopter, drones, and sniffer dogs were pressed into service in a massive manhunt for the perpetrators of last afternoon's attack. Officials said that those detained were being questioned at various levels by the security forces to ascertain the identity of the terror group, which is believed to be active in the area for more than a year and probably comprises a snipper too.