Indonesia questions captain of sunken ferry, widens search for victims

Villagers and relatives of missing passengers from a ferry accident at Lake Toba hold a prayer session at the pier of Tigaras port in Simalungun, North Sumatra, Indonesia, June 21, 2018. REUTERS/Beawiharta

TIGARAS, Indonesia (Reuters) - Indonesian police on Thursday questioned the captain of a ferry that sank without trace in a volcanic lake in Sumatra this week, warning that a criminal investigation could be launched over a disaster that has left at least 192 people missing.

Desperate relatives awaiting news of loved ones prayed and sang hymns at the port on Lake Toba after one of Indonesia's worst ferry disasters in years left four confirmed dead and 18 survivors, including the captain.