A car rammed into a mosque in the eastern French city of Colmar on late Saturday.
The vehicle crashed into the Grand Mosque of Colmar, damaging its gate and doorway, said the prefecture of Haut-Rhin.
It is unclear whether the incident was an attack or a suicide attempt.
The incident triggered a major police response and the area was cordoned off. The driver of the vehicle was apprehended and brought to a hospital with a stab wound to his neck, local media reported.
It was not immediately clear if the wound was self-inflicted or if someone else attacked the driver.
Video footage, purporting to be from the scene and showing a bloodied and motionless driver getting arrested inside the mosque by two police officers, has emerged on social media, RT reported.
An investigation was launched into the incident.