Four American college students had acid thrown at them Sunday at a train station in the French city of Marseille, but police said it did not appear to be a terror attack.
A 41-year-old woman with history of mental problems has been arrested as the alleged assailant during the late morning attack at the city's Saint Charles train station.
Regional newspaper La Provence said the assailant remained at the site of the attack without trying to flee.
The Marseille fire department was alerted just after 11 a.m. and dispatched four vehicles and 14 firefighters to the train station, French authorities said.
Boston College, a private Jesuit university in Massachusetts, identified the students as Courtney Siverling, Charlotte Kaufman, Michelle Krug and Kelsey Kosten.
The school said in a statement that the four were juniors studying abroad, three of them at the college's Paris program.
Two of the student suffered facial injuries. All four women, who are in their 20s, were hospitalized, two of them for shock.
France has seen several attacks by unstable individuals as well as by violent extremists in recent years, including in Marseille, a port city in southern France.