French anti-terrorism prosecutors have arrested five women in the southern city of Beziers and launched a preliminary investigation in connection with a possible Islamic attack plot. A police official in the Herault region confirmed the overnight arrests in the city of Beziers, and said Sunday that the DGSI domestic intelligence service and national anti-terrorist prosecutor’s office are handling the investigation. Investigators centered on an 18-year-old woman living in a housing project in Beziers who is suspected of plotting an attack targeting nearby Montpellier, according to Mayor Robert Menard. The 18-year-old’s mother and three sisters were also arrested, including one who is a minor, he said. The 18-year-old had “boasted” to neighbors about watching ISIS terrorist videos, Menard told The Associated Press, though he said he didn’t know whether she or her family had been on authorities’ radar for Islamic radicalism. The Associated Press contributed to this report