Three former ground staff of Thiruvananthapuram Airport have been detained by city police at the Bangalore airport in connection with the detection of crude explosive in the cargo hold of a Kingfisher Airlines flight in Kerala capital on Sunday. <br/><br/>Police said, the three, who had resigned only a few days before the incident, were detained on Wednesday by immigration officials at the Bengaluru International Airport while they were about to board a flight to Dubai en route to Kabul. The three were handed over to Central Industrial Security Force and later to Kerala police the same day. <br/><br/>The crude explosive was found from the cargo section of the Kingfisher plane that arrived in Thiruvananthapuram with 31 people on board from Bangalore, sparking a bomb scare and authorities admitted to a security lapse. Police had later said the crude explosive material was not of high density but could have exploded during flight due to air pressure.