ST. PETERSBURG, October 2. /TASS/. Open fire has been put out in an 18th-century mansion in downtown St. Petersburg, the city’s Emergencies Ministry department said in a statement.

"Open fire was put out at 1:45 a.m. Moscow time [10:45 p.m. Thursday GMT]," the statement says.

Firefighters are currently dampening down structural remnants of the mansion and the adjacent building, head of St. Petersburg’s Admiralteysky District Dmitry Vakushin wrote on his VKontakte page.

"At this point, structural elements are being dampened down to prevent re-ignition," he wrote.

The official added that the authorities would carry out a probe to establish causes of the fire.

Earlier, the Emergencies Ministry’s department in St. Petersburg said the flames engulfed roughly 2,250 square meters in the mansion and on the roof of an adjacent building. The firefighting effort involved 165 firefighters and 37 fire engines and units of special machinery in total.

The mansion was designed by architect Ferdinand Miller and is also known as the Bremmer House. Constructed in 1872 in the eclectic style according to a design by Ferdinand Miller, an academician of architecture, the Bremmer House has been a landmark of St. Petersburg’s social and cultural life for decades. Its ongoing renovation was supposed to be finished by the end of 2027.