Spirit Airlines Flight Hit by Gunfire While Trying to Land in Haiti, One Injured

12:18 PM PT -- The Federal Aviation Administration (FAA) tells TMZ ... the Spirit flight landed safely in the Dominican Republic at about 11:30 AM local time today, after it was damaged by gunfire while attempting to land in Port-au-Prince.

Two other U.S. flights were diverted as a precaution, and Haiti's Toussaint Louverture International Airport has since been closed, the FAA confirms.

Chaos broke out on a Spirit Airlines flight Monday as it was struck by gunfire while attempting to land in Haiti's capital city, Port-au-Prince ... injuring a flight attendant, TMZ has confirmed

The flight, which was coming in from Fort Lauderdale, was diverted from Toussaint Louverture International Airport after bullets pierced the cabin ... and it made a safe landing in nearby Santiago, in the Dominican Republic.

A flight attendant was reportedly grazed by a bullet ... and a clip circulating online shows the aircraft riddled with bullet holes inside the plane.

Toussaint Louverture International Airport was forced to ground all commercial flights after the incident ... and flight tracking showed both JetBlue Airways and Amerijet Cargo planes rerouting away from Haiti.

The incident went down just hours before Haiti's new prime minister, Alix Didier Fils-Aimé, was about to be sworn in after kicking out Prime Minister Garry Conille.

The exact cause of the gunfire is currently unknown. Armed gangs were reportedly responsible for firing on a United Nations helicopter in October, striking it and forcing it to land. No one was injured in that incident.

In a statement to TMZ, Spirit Airlines confirmed the shooting ... saying no guests were injured. The flight attendant who was grazed was being evaluated by medical personnel. The plane was taken out of service, Spirit said, and a different aircraft was being arranged to return passengers to Florida. Spirit said the airline is suspending service to Haiti.