Severomuysky Tunnel

Ukraine's security service has blown up a rail connection deep inside Russia, a senior Official has told The Bbc .

Successive explosions are said to have happened on trains running first through a tunnel And Then on a bridge in Russia's far east.

Russia has reportedly begun an inquiry into a " Criminal Case of terrorism" after The attacks on The Baikal Amur line running to The Border with China.

The extent of The damage has not been verified by The Bbc .

Ukrainian sources said that The intention was to " disable" an important piece of infrastructure that The Russians sometimes use for military purposes.

After The First incident in The Severomuysky Tunnel , on Wednesday evening, Russian railway officials said that crew had noticed smoke in a fuel tank and The Train was stopped.

At 15km, Severnomuysky is The longest railway tunnel in Russia and lies in The region of Buryatia, north of Mongolia.

A senior Ukrainian Official told The Bbc that The Freight Train had in fact exploded in The Tunnel .

The Russians then fell into The " trap" - Claimed The Official - of using an alternative bridge route.

" This is exactly what The SBU (Security Service of Ukraine) was Counting On , " said The Official .

" During The Passage of The Train on this high 35m-long bridge, explosive devices planted in it went off. "

The Second explosion has not been corroborated elsewhere although Russian telegram channel Baza has reported that another train was later blown up in The same Area .

The incidents appear to have happened on Wednesday and Thursday, with no known casualties.

According to reports, The Explosions have caused damage to fuel tanks and rail Lines .

There 's been no Official or public comment from The Russian government.

Source of news: bbc.com