Russian security serves have foiled a plot by a group of rebels to blow up a high-speed train running between Moscow and St. Petersburg, the Kommersant business daily said Monday.
A blast on the same route that authorities blamed on rebels killed 26 people in November 2009.
The respected daily said the group of North Caucasus-based rebels had already prepared a fertiliser bomb and were in the closing stages of their operation when they were arrested by Federal Security Service (FSB) agents.
FSB chief Alexander Bortnikov on July 18 reported to President Dmitry Medvedev that his service had averted a "major terror act" in the Moscow region in the preceding days.
Bortnikov added at the time that rebels had plans to target public places and "transport infrastructure" in the Moscow region.
Russia is battling insurgency in the North Caucasus, and martyrdom operations have returned to the Russian capital in recent years.
In a martyrdom operation 37 people were killed at Russia's busiest airport in January. Two female martyred rebels from that region killed 40 and wounded dozens on the underground during morning rush hour last year.
Russia's leading rebel Doku Umarov in February vowed to make 2011 "a year of blood and tears" and has claimed most recent attacks.