<br/>Kerala Police on Saturday said it has taken into custody the prime suspect in the case of planting crude explosive material in the cargo-hold of a Kingfisher aircraft in Thiruvananthapuam last week. Sources said, the person, a former contract employee at the airport, is suspected to have planted the explosive in the aircraft, but discounted any terror link in the incident. <br/><br/>A police team led by Thiruvananthapuam city Commissioner M R Ajith Kumar has been probing the case and several persons have been questioned in connection with the case.