One of the suspects had pledged allegiance to Islamic State, Russia's state secret service (FSB) said on Monday. This is a time when Russia is strenthening security, especially in big cities, including Moscow. All vehicles in Moscow had to change the route to the city center. Residents and visitors coming to the Red Square are strictly controlled. More than 10,000 barriers and hundreds of metal detectors are installed around Moscow.
It is also forbidden to bring drinks and fireworks to the square. More than 40,000 police officers and security forces have been strengthened to ensure public security on this occasion in Moscow.
