Four security guards were killed in a terrorist attack on the parliament of the North Caucasus republic of Chechnya, with some militants breaking into the building and taking hostages, Russia's Interfax news agency reported Tuesday. All militants that broke into the building have been eliminated, said Interfax citing a law enforcement source. A latest report said two militants blew themselves up at the door of the parliament building, while another three or four armed men broke into the building and began shooting. No explosions occurred inside the building, said the report. Earlier the RIA Novosti news agency said one suicide bomber killed two people just outside the parliament building on Tuesday morning. His accomplices, who arrived at the scene by car, stormed into the building and began shooting. Gunshots were heard from 9 a.m. Moscow time (0500 GMT). The clashes inside the parliament building have been over, but sporadic shots could still be heard at the scene, it reported. The authorities have not announced the exact number of casualties. The area has been cordoned off with all personnel evacuated, said RIA Novosti, adding that a special operation, led by Chechen leader Ramzan Kadyrov, was under way to eliminate the insurgents. Russian Interior Minister Rashid Nurgaliyev, who was currently in the regional capital of Grozny, has held an emergency meeting with Kadyrov over the attack, said RIA Novosti. This was the second terrorist attack in Chechnya in recent months. In August, a suicide attack rocked the Tsentori village, the birthplace of Kadyrov. Violence is common for North Caucasus republics of Chechnya, Dagestan and Ingushetia with militants frequently assaulting police officers and authorities. Moscow has vowed to bring stability to the region by improving social services, raising pensions and salaries in a bid to tackle corruption and terrorism infiltration. 