The death toll from an Indonesian ferry disaster could top 180, as authorities raised an estimate of the number of people missing two days after the wooden tourist boat sank in a lake formed in the crater of an ancient volcano.

Rescuers searching Tuesday for dozens of people missing after a ferry sank on Indonesia's Lake Toba have found bags, jackets, an ID card and other items in the waters but no new survivors, casting a tragic pall over holidays marking the end of the Muslim holy month.