Indonesia said its coast guard seized the Iranian-flagged MT Horse and the Panamanian-flagged MT Freya vessels over suspected illegal oil transfer in the country’s waters on Sunday. Coast guard spokesman Wisnu Pramandita said the tankers, seized in waters off Kalimantan province, will be escorted to Batam island in Riau Island Province for further investigation. “The tankers, first detected at 5:30 a.m. local time (2130 GMT on Jan. 23) concealed their identity by not showing their national flags, turning off automatic identification systems and did not respond to a radio call,” Wisnu said in a statement on Sunday. Wisnu told Reuters on Monday that the ships were “caught red-handed” transferring oil from MT Horse to MT Freya when they were discovered by the authorities and there was an oil spill around the receiving tanker. He added that 61 crew members from both vessels have been detained.