French investigators under enormous pressure to find saboteurs who wreaked havoc on rail network before Olympics

FRENCH investigators are frantically searching for the saboteurs who wreaked havoc on the rail network hours before the Olympics opening ceremony.

Police and security services are under enormous pressure to point the finger at who was responsible for the arson attacks on Friday.

AFPFrench investigators are frantically searching for the saboteurs who wreaked havoc on the rail network[/caption]

EPARussian despot Vladimir Putin, Iran, far-left militants and anarchists are all under suspicion[/caption]

Russian despot Vladimir Putin, Iran, far-left militants and anarchists are all under suspicion.

Explosives were detonated at key points on the network, destroying crucial cables and creating widespread disruption for those trying to reach the Games.

Samples from each site have been rushed to a laboratory, with 50 officers drafted in to work on the case from the gendarmerie, an arm of the military responsible for security.

An unexploded device found on the tracks between Paris and Lyon after rail workers thwarted an attack is also being examined for fingerprints.

And four unexploded devices from another plot on May 8 — the day the Olympic flame passed through Marseille — are being scrutinised, but no link has yet been found to last week’s attacks.

Two men wearing balaclavas were seen running away from the failed attempt.

They are believed to have left forensic evidence in a signal control tower before they fled in a van.

The head of the SNCF rail company said trains would run normally from tomorrow after emergency repairs.

The delays hit British travellers on one of the busiest weekends of the year — with one in four Eurostar trains cancelled yesterday.