Police have been given 15 days to interrogate the owner of a Bangladesh building that collapsed last week, killing at least 384 people.

Rescue workers in Bangladesh have given up hope of finding any more survivors in the rubble of a building that collapsed five days ago and began using heavy machinery to remove the rubble and look for bodies, an official said.

Police in Bangladesh arrested two owners of a garment factory in a shoddily-constructed building that collapsed this week, killing at least 324 people, as protests spread to a second city today with hundreds of people throwing stones and setting fire to vehicles.