Three migrants died after being hit by train in southwest France, with a fourth has been left in a serious condition.
The migrants were lying on train tracks when it passed while on its way to Bordeaux.
A police investigation is under way but the circumstances of the incident remain unclear.
The mayor of Ciboure said the area was well-known as a transit route for migrants.
Mayor Eneko Aldana-Douat told BFM TV the migrants “were sleeping or lying” on the tracks.
It was not clear why they were lying on the tracks, a police spokesperson said.
Police are trying to identify the migrants. Citing a police source, the Parisian newspaper said all of them were Algerian nationals.
The one who survived suffered a broken leg, local prosecutors told the AFP news agency.
Amnesty International has earlier condemned European states for being responsible for the “horrific violations” against migrants.
The rights group has documented in a 50-page report “harrowing violations, including sexual violence, against men, women and children.”
The report was based on testimonies of 53 refugees and migrants, aged between 14 and 50. The refugees were from countries such as Nigeria, Somalia and Syria, who were mostly still in Libya.
Thus, Diana Eltahawy, Amnesty’s deputy director for the Middle East and North Africa, called the rights group’s new report “horrifying”.