ADDIS ABABA, Jan. 1 (Xinhua) -- At least 12 people were killed after a boat capsized Monday night in Tana Lake in Ethiopia's northern Amhara regional state, state media reported on Tuesday.

It was not clear how many people were aboard the boat, which also carried goods, Amhara Mass Media Agency (AMMA) said.

Police blamed overloading for the tragedy, AMMA said.

Rescue crew are searching for possible survivors and retrieving drown victims on Ethiopia's largest lake, police said.