(ZANZIBAR, Tanzania) -- At least 187 people died after a ferry sunk Saturday off the coast of Zansibar, an island off Tanzania.
BBC News reports the overcrowded passenger ferry carrying at least 800 passengers was travelling between Zanzibar's two main islands, Unguja and Pemba, when it capsized at 3:00 a.m. local time in rough waters.
Survivors were seen floating on mattresses awaiting rescue. Nearly 620 were rescued, and 187 bodies have been pulled from the water.
The ferry was carrying twice its allotted load—with over 120 tons of sugar, rice and wheat flour on board.
The commuter ship is typically limited to 60 tons of cargo.
It is unknown if there were any Americans on board at this time.
Copyright 2011 ABC News Radio