San Francisco fire officials are investigating the cause of a fire that broke out inside a residential building in South of Market on Saturday afternoon.

Thirty-seven firefighters responded to a fire reported on the fifth floor of the 13-story apartment building at 330 Clementina Street at 4:18 p.m. The blaze was contained at 4:37 p.m., according to the San Francisco Fire Department.

No injuries were immediately reported.

The cause of the blaze is under investigation. Fire investigators do not consider the blaze to be suspicious at this time, said San Francisco fire Lt. Jonathan Baxter.

Lauren Hernandez is a San Francisco Chronicle staff writer. Email: lauren.hernandez@sfchronicle.com Twitter: @LaurenPorFavor