[Photo:  Passengers on Tarmac of Ft. Lauderdale Int'l Airport  /  WSVN TV]

Gunshots erupted at the Fort Lauderdale airport on Friday, leaving multiple people dead. Authorities say the gunman, who appeared to be acting alone, is in custody. Here's the latest on what we know:

• 5 people are dead.
• 13 people were transported to a hospital.
• Multiple reports on social media - including tweets from former White House spokesman Ari Fleischer -- described the shooting.

I'm at the Ft. Lauderdale Airport. Shots have been fired. Everyone is running. - Ari Fleischer tweet.

"Everybody started running...I just ran" says witness separated from her family after Ft. Lauderdale shooting https://t.co/LN93bBnwRT - CNN Newsroom tweet.

Investigators are looking into the gunman's motive, Broward County Mayor Barbara Sharief told CNN. Investigators haven't released his name or detailed the events leading up to the shooting. The shooting occurred in the baggage claim area of Terminal 2.Parts of the airport were evacuated. Aerial footage from CNN affiliates showed large groups of people standing outside on the tarmac.

More than an hour after the shooting, officials had allowed people to return into the airport, but tensions were still running high, a witness told CNN. "Everyone sprinted outside again. We are back out on the tarmac," Judah Fernandez said, adding that it was unclear why people had rushed outside.

Investigators say they're looking into unconfirmed reports of additional shots fired on airport property. The TSA advised people at the airport to shelter in place.