A photograph of the moment of the attacker's murder that he shot with a tinnikov at the Russian secret service building

A shooting witness in Moscow has filmed the moment of the attacker's murder, opening fire with Kalashnikov near the headquarters of the Russian Secret Service.

The man dressed in black from head to foot, was hiding behind a concrete pole, and after shooting several bullets, one can see how he falls to the ground, although it was earlier reported that three persons were involved in the attack, police have flatly denied him by saying the person killed by police acted alone.

And one FSB member lost his life, and another five were hospitalised. Instead of the incident, law enforcement agencies have found a grenade and a bag with suspicious tools.