(DHAKA, Bangladesh) — A fire broke out Thursday in an office building in Bangladesh’s capital and some people were feared trapped inside, witnesses and an official said.

Fire Department control room official Ershad Hossain said at least 19 firefighting units were working to douse the blaze and rescue people inside the FR Tower, located on a busy avenue in Dhaka’s Banani commercial district.

There was no immediate confirmation of casualties, although some reports said several people fell from the building trying to escape the fire.

Witness Sajib Hasan said some people were seen shouting for help from windows on the upper floors of the building. Columns of smoke were deterring efforts by rescuers to get close to them.

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