BASEL, Switzerland — An armed gang of masked men raided a casino packed with about 600 guests early Sunday and made off with hundreds of thousands of dollars, according to Swiss prosecutors.

In a statement, prosecutors in Basel described a scene like an action-film heist: About 10 men dressed in black arrived in two cars at the Grand Casino near Basel shortly after 4 a.m.

One smashed the front door with a sledgehammer, and the others ran inside with machine guns and pistols, the statement said. Speaking French, a group of men ordered the guests and employees to the floor, while their accomplices emptied registers in the basement and an upper floor, it said.

They couldn’t get into the strong room, despite shooting at the locked door, prosecutors said.

“The criminals fired a number of shots, but luckily no one was hit,” said the statement.

It said some guests and one security guard were lightly injured from being hit or stepped on, and that Swiss and French police were trying to track down the thieves.

Swiss police said the men fled the casino quickly, driving away in two silver Audis with French license plates.