PHILADELPHIA (AP) — Philadelphia police have charged a fast-food worker who they say threw hot grease on a customer during an argument.

Authorities say the incident happened around 3 a.m. Saturday at a Checkers in southwest Philadelphia.

Police say three women at the restaurant’s drive-thru window received the wrong order. The women told police an argument ensued after the female employee refused to change the order. Police say the employee threw containers of grease at the women.

The driver was taken to the hospital with first-degree burns while the other two women were treated at the scene.

Police have charged the employee with multiple offenses including aggravated assault.

A Checkers spokesperson said in a statement that the franchise is cooperating with police.