At least 23 people were injured though none of the injuries was life-threatening, Police Sergeant Jesica Ryan said.

The explosion demolished the building, leaving behind only part of its metal frame. The restaurant, called PizzaFire, had been out of business for several months. The blast also blew out the windows of a popular fitness club next door at the shopping plaza in Broward County.

A firefighter walks through the remains of a building after the explosion in Plantation, Florida.

A firefighter walks through the remains of a building after the explosion in Plantation, Florida. Credit:AP

Jesse Walaschek had just left the fitness club with his wife and three children, ages 4, 6 and 8. They were parked near the restaurant and had just driven about 50 yards (45 meters) away when they heard the blast.

“It was a massive explosion like I have never experienced,” he said.

Walaschek said dust and debris filled the air.

“Everything just stopped. You didn’t see anybody. I just wanted to get these guys safe,” he said, pointing to his children. “If this had happened a minute before when we were getting the kids in the car, it would have been really bad.”

Dozens of firefighters responded and could be seen picking through the rubble with dogs sniffing through the debris to make sure people weren’t trapped underneath. There were no known fatalities immediately after the explosion.

Fire department Battalion Chief Joel Gordon said there were ruptured gas lines when firefighters arrived, but he couldn’t say for certain that it was a gas explosion.

“At this point, nobody was killed. Thank goodness for that. As bad as it is, it could have been a lot worse,” Gordon said.

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