One of the Nigerians arrested had allegedly swallowed dozens of capsules filled with more than a kilogram (2.2 pounds) of methamphetamine.

Indonesia is a major hub for drug trafficking in Southeast Asia and has strict drug laws, with convicted smugglers sometimes executed by firing squad.

Gatot Sugeng Wibowo, chief of customs at Soekarno-Hatta, said officers arrested Malachi Onyekachukwu Umanu, a Nigerian who arrived at the airport from Ethiopia on March 5 with no suitcase or bag.

His suspicious behavior prompted officers to check his body, and an X-ray turned up some 64 capsules inside his stomach. Authorities managed to force all the capsules, which were filled with a total of 1.07 kilograms (2.3 pounds) of crystal methamphetamine, out of his stomach within three days, Wibowo said.