French state rail operator SNCF stepped up security patrols and identity checks Wednesday on trains in eastern France following an intelligence tip-off about a possible attack.| French authorities were alerted overnight Tuesday by a third country of an attack risk on the line linking Luxembourg with the Swiss city of Basel |
Regional French authorities earlier stepped up security procedures after receiving warnings of "a specific terrorist threat". Luxembourg and Germany have taken similar steps, the source said. A French official said such alerts were not infrequent, but that French intelligence services had been informed of the situation.