GETTY/AFP An ISIS terror attack on Moscow has been foiled

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Armed police raided an apartment in the Russian capital on Sunday and discovered a home-made bomb packing a devastating 11 pounds of explosives, which Islamist fanatics were planning to detonate on crowded buses and trains. Russia's Federal Security Service (FSS) said that detectives have arrested 15 people in connection with the plot, some of whom were trained at ISIS camps in Syria.

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Some of them have already confessed to the plot and admitted they planned to blow up public transport, according to local media reports. The bomb was said to be around the same size as the one used by ISIS fanatics who killed more than 100 people at a peace rally in Turkey last week.

GETTY The Islamists were targeting public transport

GETTY An image released by Russian government showing the bombing of an ISIS training camp

A spokesman for the FSS said: “There was a set address in Moscow where between six and 11 people periodically stayed, some of whom participated in Isis military training camps in Syria. “They arrived back in Russia long before the start of Russia’s military operation [in Syria].” He added that during the interrogation of two detainees, it “quickly became apparent that they planned to carry out a terrorist attack on public transport in Moscow”.

EPA Putin with F1 chief Bernie Ecclestone at yesterday's race in Russia

They planned to carry out a terrorist attack on public transport in Moscow Security service spokesman

Security forces evacuated more than 120 residents from the apartment block on and cut the off gas supply to the building while bomb disposal teams defused the device. One official said the bomb was around the same size as the one used at a pro-Kurdish rally in Ankara on Saturday. However, they added that unlike the ISIS jihadis in Turkey - who were suicide bombers - these plotters intended to detonate their device using a mobile phone.

Experts have expressed fears that Russia could be targeted by Islamist fanatics because of president Putin's bombing campaign against ISIS in Syria. Pentagon chief Ashton Carter said the country's meddling in the Middle East would have "consequences" back home, adding people were "rightfully fearful of attacks on Russia”.

Russian jets have pounded more than 100 ISIS outposts in the past few weeks as Putin looks to shore up the rule of his long-time ally Bashar al-Assad. Recent reports suggest that the Syrian dictator has begun to win back territory from the jihadis and more moderate opposition groups including the Syrian Free Army, which has also been targeted by Putin.