PARIS — Four American college students were attacked with acid by a woman on Sunday at a train station in southern France, injuring at least two of them, according to the local police.

The assailant, a 41-year-old woman, was quickly arrested in the Mediterranean port city of Marseille. The police prefecture said they were not treating the attack on the American women as a terrorist assault.

The suspect has “a psychiatric history,” a spokeswoman for the police prefecture in Marseille said. “For now, nothing suggests that this was a terrorist attack.”

The four American women, all in their early 20s, were in front of the Saint-Charles train station when a woman threw hydrochloric acid on them shortly before 11 a.m., the police said.