A fire spread up a high-rise apartment building by strong winds in a South Korean port city left scores of people with minor injuries, officials said Friday.

Footage from the scene in Ulsan showed a huge ball of orange flames soaring up the 33-floor building and shooting through the roof as firefighting crews tried to put out the blaze from below.

There were no immediate reports of deaths or serious injuries. Hundreds of residents evacuated as the fire broke out while workers rescued another 77 who had escaped to the roof or other spaces.

South Korea’s Ministry of the Interior and Safety said at least 88 people were treated for minor injuries such as scratches or lightly inhaling smoke.

Officials are investigating the cause of the fire, which they said started at a balcony in one of the lower floors late Thursday and spread up the exterior of the building amid strong winds. The fire was nearly put out as of 9 a.m. Friday.