Three Palestinian college students were shot in Burlington, Vermont, on Saturday evening, prompting calls from civil rights organizations and the victims’ families for authorities to look into possible bias by the attacker.

The 20-year-old men are all receiving medical care, according to a Sunday news release from the Burlington Police Department. “Two are stable, while one has sustained much more serious injuries.”

The students were walking on Prospect Street while visiting a relative in Burlington for the Thanksgiving holiday when “they were confronted by a white man with a handgun,” says the release.

“Without speaking, he discharged at least four rounds from the pistol and is believed to have fled on foot,” police said.

Police said that two of the victims are US citizens and one is a legal resident.