An individual has scaled the monument to the victims of the Smolensk air disaster, in the center of Warsaw, and is threatening to blow himself up, according to several Polish media reports this Saturday, on the eve of the general elections this Sunday.

“Currently, for security reasons, Pilsudski Square and the adjacent area are closed to traffic. Police officers are at the scene,” the Polish capital's police announced on their social networks.

According to the Onet information portal, the individual, whose motives are currently unknown, is carrying a backpack and holding an unidentified object in his left hand that could be a detonator.

According to an eyewitness interviewed by the Wiadomosci newspaper, anti-terrorist police have been deployed to the nearby Sofitel hotel and a negotiator is communicating with the individual via megaphone.

Poland holds general elections this Sunday, in which 30 million Poles are called to decide whether to revalidate the Government led by the ultra-conservative Law and Justice party (PiS) for a third consecutive term.

In the Smolensk air disaster, a plane carrying the Polish president, Lech Kaczynski – twin brother of the current deputy prime minister and president of the PiS, Jaroslaw Kaczynski – among other senior officials, crashed near that Russian city in 2010.