A fire engulfed a garment factory outside Bangladesh's capital Dhaka, trapping many workers and killing at least 112 people in the building without emergency exits.

Authorities said the fire started on the ground floor late Saturday and spread upward, cutting off staircases and preventing workers' escape. Some survivors were rescued from the eight-story building's roof.

Thousands of onlookers and anxious relatives gathered at the burned-out factory Sunday awaiting word on relatives who worked there.

Bangladesh has some 4,000 garment factories, many without proper safety measures. The country annually earns about $20 billion from exports of garment products, mainly to the United States and Europe.

Here are photos of the fire and its aftermath: