A train which derailed North of Moscow overnight killing more than two dozen people was an act of terror say Fox News sources in the Russian President’s and Prime Ministers offices.

“We have no doubt this was terror” said one source close to Russian President Medvedev, but he added “who did this and why? We don’t know yet.”

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The Nevsky Express was traveling at close to 125 miles per hour and only half way through its four and a half hour journey to St. Petersburg from Moscow when disaster struck. A bomb say authorties detonated near the rear of the train.

With more than 600 passengers on board the last three  cars derailed sending passengers “flying through the cars like match sticks” said one victim.

As the train rapidly slowed,  cars were crushed and flipped on their sides.  The head of the Russian Federal Security Service has told a Russian news agency 14 pounds of explosives were used in the terror attack.  And later another official suggested the explosive may have been inside one of the cars but that has not officially been confirmed.

And a second bomb detonated at the scene some 17 hours later during the cleanup operation say Russian sources. No one was injured in that blast.

The derailment occurred in a remote area hampering rescue efforts.   Some of the 100 injured passengers were driven to St. Petersburg.  Others were moved to Moscow by air and by road.

Initially Russian authorities said 26 were killed and 18 others were  missing.

A similar attack occurred on a Russian train on the same line in 2009 but details of that attack and its motives have remained murky. Two Russians were arrested after that bombing and one is still being sought.  No one died in that incident.

The Russian Prosecutor in charge of investigating this attack says bomb residue has been taken from the scene and that the blast created a five foot deep crater.

There have been numerous attacks in Russia in recent years carried out by Chechen separatists and also a growing number of violent incidents involving Ultra Nationalists.

But so far Russian authorities are not certain who carried out this bombing on the Nevsky Express.