At least 20 people were injured Saturday, including two seriously, after an apparent gas explosion shattered parts of a shopping mall in the South Florida city of Plantation, authorities said.

Firefighters were searching for other injured people but believe all have been taken to hospitals for treatment, said Plantation Fire Department deputy chief Joel Gordon.

The Plantation Fire Department initially said a gas explosion had occurred. But officials later said they are still confirming the cause.

“We had ruptured gas lines. We did have an active gas leak when we arrived, (but) they were able to secure it,” Battalion Chief Joel Gordon said, referring to the Broward County’s hazardous materials team that initially secured the lines and TECO, a gas utility company.

“Whether that was the cause or not, we have not confirmed,” he said.

News footage and social media video showed firefighters arriving at the mall. Windows were blown out of an LA Fitness. A section of the complex appeared to sustain significant damage, with shattered windows and scattered debris.

Scene of gas explosion at Plantation mall.
Scene of gas explosion at Plantation mall.

Plantation police tweeted: “All stores and businesses in the area of the Fountains Plaza and the Plantation Marketplace plaza near LA Fitness will be shut down until further notice until Fire Personnel can determine that it is safe to return. Please do not come into this area if possible.”

It’s unclear if the mall was open at the time of the explosion.

In one social media video posted after the blast, people are seen surveying the aftermath, which included damage to cars and water cascading from an upper floor of a building.

“The whole building blew up,” one man is heard saying.

Aftermath of gas explosion in Plantation, Florida.
Aftermath of gas explosion in Plantation, Florida.

CNN affiliate WPLG reported that fire departments from Plantation, Davie, Lauderhill, Coral Springs, as well as Broward Sheriff Fire Rescue all responded. A triage area was set up.

“A bomb just went off,” a man says in a video sent to the station.

Residents several miles from the blast reported feeling their homes shake, the station reported.