Manila (AFP) - Overloading of cargo and passengers might have been to blame for a Philippine ferry disaster which left dozens dead, an official said Saturday, and a government investigation is now underway.Survivors reported seeing up to 150 sacks of cement in the ship's cargo area before it capsized in relatively calm seas off the central port of Ormoc on Thursday, city councillor Godiardo Ebcas told AFP.Bloated bodies spilled out of the Kim Nirvana's wooden hull as a crane lifted it from the water and placed it on Ormoc port, he said.Ebcas said the death toll stood at 56 with 142 survivors.