THE older brother of the suspected mastermind of the St Petersburg attack has been arrested, Russia’s Federal Security Service confirmed.

Akram Azimov, 29, was detained in a village near Moscow on Wednesday, the security service, also known as the FSB, said in a statement.

6 Akram Azimov was detained in a village outside Moscow Credit: Getty Images

6 Akram Azimov is said to be the older brother of Abror Azimov, the suspected planner Credit: Getty Images

He is believed to have transferred funds used for the attack and set up links with international terrorist organisations.

Dramatic footage of his arrest released by the FSB appear to show a military grenade in his money belt, Tass news agency reported.

His younger brother Abror Azimov, 27, is suspected of planning the St Petersburg metro attack which killed 14 and injured more than 50 people.

6 Akram Azimov is believed to have transferred funds used for the attack and set up links with international terrorist organisations Credit: Getty Images

6 Video footage appeared to show a grenade in his money belt Credit: Getty Images

Suicide bomber Akbarzhon Jalilov, 22, thought to be Russian national born in Central Asian Kyrgyzstan, died in the blast.

Both Azimov brothers are naturalised Russian citizens from Kyrgyzstan.

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Abror Azimov, who was detained last Monday, has been accused of "carried out training of the suicide bomber terrorist Djalilov," the FSB said, calling him "one of the organisers."

At a court appearance, he denied that he helped mastermind the attack but admitted indirect involvement in it.

He is being held in custody until June 3 as investigations continue.

6 Abror Azimov is suspected of planning the attack Credit: Reuters

Since the attack in St Petersburg, Russian authorities have detained 10 people suspected of involvement.

All suspect are originally from Central Asia - a region of five mainly Muslim states that border Afghanistan, Iran and China.

No one has claimed responsibility for the attack, but investigators are probing possible ties to Islamic State.

6 Horrific images from inside the carriage revealed the extent of the blast

The attack happened on the same day Russian President Vladimir Putin was visiting St Petersburg, his native city.

If it is proven that the bombing was carried out by radical Islamists - it could pose a test for Putin's policy of military intervention in Syria.

ISIS has previously threatened to take revenge for Russian air attacks on Syria by shedding blood on Russian soil.

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