Four U.S. tourists were attacked in France on Sunday when acid was thrown in their faces.
The incident was not terror-related, French officials confirmed to Fox News.
She did not have any more details and spoke on condition of anonymity, per the French judicial system. The tourists were on their way from the southern city to Paris.
In past occurrences in Marseille, a driver purposely smashed into two transport stops a month ago, killing a lady, yet authorities said it wasn't fear related.
USA authorities in France are not immediately commenting further on what happened to protect the privacy of the American tourists, embassy spokesman Alex Daniels said.
Two of the tourists, aged 20 and 21, received facial injuries and have been taken to hospital.
The women were sprayed with acid by a 41-year-old woman who has been detained by police, according to the Marseille prosecutor's office. Paris prosecutor Francois Molins told columnists the two suspects "were preparing to do a fast approaching, fierce activity" on French an area. He told police he acted in the name of the Islamic State group.