Terrorist attack on train in Russia

There was a terrorist bombing aboard a train line in Russia often frequented by politicians/diplomats, and amazingly enough, they had the guts to call it what it was (Hat tip: Power Line):

Russian officials opened a terrorism investigation Saturday, saying that a homemade bomb planted on the tracks of the high-speed Moscow-to-St. Petersburg route caused a derailment that killed at least 26 people and injured dozens more.

The head of Russia's Federal Security Service, Alexander Borotnikov, was quoted by the Interfax and RIA Novosti news as saying that an improvised explosive device equivalent to 15 pounds (7 kilograms) of TNT had detonated when the train passed over it Friday night. Remains of the device were found at the site of the crash, Borotnikov said.

Chechen Muslims are the most obvious suspects, but no responsibility claims for the attack have been made yet.