HONG KONG — A ferry that sank Monday in a lake in Indonesia, leaving as many as 192 people missing and presumed dead, was badly overloaded beyond its capacity of about 40, officials said.

Emergency responders continued to search Lake Toba on the island of Sumatra, but as the possibility of rescuing survivors has faded, they have shifted their focus to finding the boat and the bodies believed to be inside.

“We now consider this a recovery effort rather than a search and rescue due to the amount of time that has elapsed since the sinking,” Wanda Ketaren, a National Disaster Management Agency official, told CNN.