Two people were critically injured when an apartment caught fire in North Charleston Wednesday night.

The fire was reported at 8:22 p.m. at Joseph Paul Apartments on Bonds Avenue, which comes off Dorchester Avenue just west of Interstate 26.

Firefighters saw heavy smoke and flames coming out a first-story window when they arrived, Fire Department spokeswoman Bianca Bourbeau said. They were able to contain the blaze to one apartment, although a second unit was damaged by smoke.

Two residents of the apartment that caught fire were taken to Medical University Hospital in critical condition, she said.

Two families were displaced by the blaze, Bourbeau said.

The cause was under investigation.

Reach Dave Munday at 937-5553.