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Russia says men detained in foiled Moscow terror plot were Russians trained by Islamic State

  • A Russian policeman speaks to the media in the building where homemade explosives were found in an apartment, in Moscow, Russia, Monday, Oct. 12, 2015. Russia's counterterrorism agency says it has raided a Moscow apartment and arrested a group of people who were preparing to carry out an attack in the capital. (AP Photo/Alexander Zemlianichenko)

    A Russian policeman speaks to the media in the building where homemade explosives were found in an apartment, in Moscow, Russia, Monday, Oct. 12, 2015. Russia's counterterrorism agency says it has raided a Moscow apartment and arrested a group of people who were preparing to carry out an attack in the capital. (AP Photo/Alexander Zemlianichenko)  (The Associated Press)

  • People walk near to the building where homemade explosives were found in an apartment, in Moscow, Russia, Monday, Oct. 12, 2015. Russia’s counterterrorism agency says it has raided a Moscow apartment and arrested a group of people who were preparing to carry out an attack in the capital. (AP Photo/Alexander Zemlianichenko)

    People walk near to the building where homemade explosives were found in an apartment, in Moscow, Russia, Monday, Oct. 12, 2015. Russia’s counterterrorism agency says it has raided a Moscow apartment and arrested a group of people who were preparing to carry out an attack in the capital. (AP Photo/Alexander Zemlianichenko)  (The Associated Press)

  • Members of the media film as a Russian policeman stands at an entrance of the building where homemade explosives were found in an apartment, in Moscow, Russia, Monday, Oct. 12, 2015. Russia’s counterterrorism agency says it has raided a Moscow apartment and arrested a group of people who were preparing to carry out an attack in the capital. (AP Photo/Alexander Zemlianichenko)

    Members of the media film as a Russian policeman stands at an entrance of the building where homemade explosives were found in an apartment, in Moscow, Russia, Monday, Oct. 12, 2015. Russia’s counterterrorism agency says it has raided a Moscow apartment and arrested a group of people who were preparing to carry out an attack in the capital. (AP Photo/Alexander Zemlianichenko)  (The Associated Press)

Russia's intelligence agency says the men detained on Sunday in a suspected terrorist plot were Russians who had been trained by the Islamic State group in Syria.

The FSB agency in a statement released on Monday did not say how many people were detained, but said two said they had been trained by Islamic State militants and were plotting a terrorist attack on Moscow's public transport. The FSB says the men had arrived in Moscow "well before" Russia began carrying out airstrikes in Syria.

Russia's counterterrorism agency on Sunday raided a Moscow apartment and arrested several people who allegedly were preparing to carry out an attack in the capital.

The FSB said an improvised explosive device with five kilos (11 pounds) of unidentified explosives was found in the apartment.