Indonesian authorities have detained two more cargoships for allegedly violating its territorial waters, South Korea's foreign ministry has said.

The ships have South Korean crew onboard and one has been held for more than three months.

South Korean operator NDSM's 5,000-cbm LPG carrier DL Lily (built 2010) was held on 9 October en route to Singapore. It is at an anchorage near a naval base between Batam and Bintan islands, with eight South Koreans and eight Indonesians onboard.