A United Arab Emirates air force plane was detained by Indian authorities because its crew did not divulge it was carrying arms and ammunition to China, a security official said Monday. The aircraft, which was flying to China from the UAE, landed in the eastern Indian city of Kolkata for refueling Sunday, said Jayati Ghosh, a senior airport security official. Indian customs officials found arms and ammunition during a customary check of the aircraft, said Wing Cmdr. Mahesh Upasani. The 10-member crew were being questioned about why they failed to declare the plane's cargo, he said. On the customs form, “the operator had written that they are not carrying arms and ammunition”. He said he did not know the type of weapons and the quantity on board as the matter was being investigated by customs authorities.