MELROSE - A three-alarm fire ripped through a 27-story apartment building in the South Bronx this morning, injuring 37 people, including a child.

Fire officials say the fire started at around 7:30 a.m. on the fifth floor of the apartment building at 225 East 149th St. Fire officials say most of the victims suffered from smoke-related injuries, as thick smoke filled up stairwells and hallways while people tried to escape. Authorities say three residents went into cardiac arrest during the incident.

Five firefighters were also treated for smoke inhalation.

Investigators are trying to determine what caused the fire.