A gunman has killed two people and wounded four after he was reportedly asked to put a face mask on in a public services office in Moscow, city authorities said. The attacker, who has not been named, is a 45-year-old Moscow resident and he had been arrested, the Russian interior ministry said. Two employees at the centre - an administrator and a security guard - were killed in the shooting, the Russian capital's deputy mayor Anastasia Rakova said. Among the injured is a 10-year-old girl who was rushed to a children's hospital in a 'serious condition'. Three wounded adults were being operated on. A gunman has killed two people and wounded four after he was reportedly asked to put a face mask on in a public services office in Moscow, city authorities said Police and investigators are seen at the Moscow government services center in Moscow, Russia, on Monday The incident took place at the Ryazansky Public Offices Centre, a multi-functional government office that deals with a variety of administrative issues in south-eastern Moscow. A law enforcement source said that the man drew out a gun and started firing shots after an argument with a security guard who asked him to put on a face mask, state news agency Tass reported. Masks are mandatory in indoor public places like the municipal services centre, where residents apply for passports, obtain property documents and get help with other bureaucratic tasks. Rakova said the Ryazansky Public Offices Centre's staff and visitors were 'immediately' evacuated when the shooting started at around 3:00 pm Moscow time (1200 GMT). The man entered the centre 'and started firing at the citizens there, after which he tried to hide,' the Russian interior ministry said. A law enforcement officer who was at the scene 'managed to catch and neutralise the attacker,' the ministry said, quoting its representative Irina Volk. Police and ambulance vehicles parked at the Moscow government services center in Moscow, Russia, on Tuesday after a gunman opened fire and killed two people Police guard an area near the Moscow government services center in Moscow on Tuesday Russia's Interfax news agency reported, citing an unnamed source, that a Glock handgun had been found at the site of the shooting. Ownership of handguns and other short-barrelled weapons is severely restricted in Russia. Only professional sports shooters are allowed to own them, and the weapons must be stored at shooting clubs. Several agencies also reported that the attacker was a former military serviceman. The shooter's identity and his motivations have not yet been disclosed. Russia's Investigative Committee has launched a criminal probe into the fatal shooting on charges of murder and illegal arms trafficking. In a statement, it said a man had entered a room in the government-run building and 'opened fire with a firearm on the people who were in the room.' 'Two people were killed on the spot from their injuries,' it said. The wounded, including the child, were being given medical help, the committee added. The shooter will in the meantime undergo a psychiatric examination. Mass shootings in Russia are rare but the country was rocked by two separate tragic killing sprees - one at a school, another at a university - this year, spurring lawmakers to tighten laws regulating access to guns. Authorities have blamed foreign influence for previous school shootings, saying young Russians have been exposed online and on television to similar attacks in the United States and elsewhere. In one high-profile public shooting in 2019, a gunman opened fire near the FSB domestic intelligence agency headquarters in central Moscow, killing an officer and wounding five people. Other high-profile shooting cases have taken place in Russia's army. In November 2020, a 20-year-old soldier killed three fellow servicemen at a military base near the city of Voronezh south of Moscow. In a similar attack in 2019, a young recruit shot dead eight servicemen. All rights reserved for this news site (dailymail) and under his responsibility