MANILA — Security camera footage released Saturday of the casino attack in Manila that killed 37 people shows an armed man setting fires in several rooms and stealing gambling chips but making no attempt to shoot fleeing customers and employees.

A Philippine police spokesman, Oscar Albayalde, said the authorities released the footage to show the public that the still-unidentified man acted alone and that his motive was robbery, not terrorism, in the attack early Friday morning at the Resorts World Manila.

“If he was really a terrorist, with all the ammunition he had with him, he would have shot everyone there,” Mr. Albayalde said. “He could have killed hundreds of people.”

The Islamic State has claimed responsibility for the Manila attack, but the police investigation has found no evidence to support that claim, Mr. Albayalde said.