A second explosive device detonated in the last hours in the place where the “Nevsky Express” had been the target of a terrorist attack, without causing further casualties or injuries, said today the president of Russian Railways, Vladimir Yakunin.

Yakunin said the bomb went off at 2:00 p.m. (1100 GMT) near the site of the first blast which officials said caused the luxury express train to career off the tracks.

The train, which derailed North of Moscow overnight killing more than two dozen people was the target of an act of terror, Russian officials said.

The second, less powerful, bomb is not thought to have injured anyone according to local authorities.

From a series of suicide bombings in Moscow in 2004, analysts say the alleged terrorist incidents traditionally have sparked investigations of links with separatists in Chechnya, where Moscow has fought two wars over the past 15 years. Nobody has claimed responsibility publicly for the last alleged attack.

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.