Investigators are “working hard” to determine the motive behind a shooting that left three Palestinian college students wounded in Vermont, Burlington Police Chief Jon Murad said Monday.

“We still do not know as much as we want to know,” Murad said at a press conference two days after the shooting. “But I would urge the public and you in the media to avoid making conclusions based on statements from people who know even less than we currently do. We are working hard to find out this information.”

Jason J. Eaton, 48, was arrested Sunday and charged with three counts of attempted murder in the second degree. He pleaded not guilty Monday and is being held without bond.

“Although we do not yet have evidence to support a hate crime enhancement, I do want to be clear that there is no question, this was a hateful act,” prosecutor State Attorney Sarah George said Monday.

The three students remain hospitalized in an intensive care unit, said Rich Price, who is the uncle of one of the shooting victims and was hosting the students for Thanksgiving.