EAST BERLIN (AP) _ An East German company is taking over sale of pieces of the crumbling Berlin Wall, with the proceeds to be donated to humanitarian causes in East Germany, the official news agency ADN said Wednesday.

''Limex-Bau Export-Import Co. is taking over the sale of available original parts of the Berlin Wall,'' ADN said.

''Profits will be used solely for humanitarian purposes, such as health facilities,'' ADN said, quoting the state-owned company's manager, Peter Pfannschmidt.

East German border troops will help secure parts of the wall made available for sale, ADN said.

Up to now, sale of parts of the wall had been left up to companies outside East Germany, the report said. It did not identify the firms.

Since the Berlin Wall was opened Nov. 9, hundreds of souvenir hunters have flocked to the western side of the barrier daily to chisel away pieces.

Ambitious hawkers have been selling small chunks of the wall to tourists in West Berlin for prices ranging from $2.95 to $29.

In most cases, authorities have not interfered with the wall chiselers, but last week West Berlin police detained two Americans and a West Berlin man who had loaded five 3-foot-by-8-foot sections of the wall onto a truck. The men, who were not identified, were released.