Eleven men from Russia"s North Caucasus...

Kommersant said terrorism charges were filed against the men on Wednesday. Prosecutors did not immediately confirm the information.

Twenty-seven people were killed and 90 injured when a bomb equivalent to 7 kg (15 lbs) of TNT derailed the Nevsky Express train on November 27, 2009.

A second, weaker bomb exploded the next day, and is believed to have targeted investigators. It slightly injured the head of the Investigation Committee Alexander Bastrykin and his colleagues.

Lawyers for the accused said their clients denied the charges.

On Wednesday, Russia"s Supreme Court upheld sentences given to two men, also residents of Ingushetia, jailed in connection with an earlier attack on the Nevsky Express train in August 2007, in which over 30 people were injured.

The men were convicted on terrorism charges relating to the illicit trafficking of explosives and sentenced to 10 and four years in prison.

MOSCOW, April 1 (RIA Novosti)