The Federal Bureau of Investigation has begun its search through the Russian diplomatic facilities in the U.S. that the Trump administration ordered to be vacated.

Video posted by the official Twitter account of the Ministry of Foreign Affairs of the Russian Federation on Saturday shows FBI agents entering and searching buildings in Washington, D.C., and San Francisco.

The FBI in the Consulate General of Russia in San Francisco https://t.co/8rxzyIrNfg@consulrussiaSF pic.twitter.com/jtmRn3WrcD — MFA Russia 🇷🇺 (@mfa_russia) September 2, 2017

"In violation of international law and their own legislation US authorities invaded Trade Representation of Russia in Washington," said one tweet.

In violation of international law and their own legislation US authorities invaded Trade Representation of Russia in Washington pic.twitter.com/dKqmtxAMM3 — MFA Russia 🇷🇺 (@mfa_russia) September 2, 2017

Earlier in the day, the Russian foreign ministry summoned acting U.S. mission head Anthony Godfrey to protest an "intention of the American authorities to conduct a search" at the country's facility in Washington, D.C., one of three diplomatic buildings in the country that U.S. officials called to vacate by Saturday.

The move by the Trump administration is retaliation that came in response to Russian President Vladimir Putin ordering the U.S. to reduce its diplomatic staff in Russia by 755 employees as backlash to U.S. sanctions over 2016 election interference.

The FBI in the Consulate General of Russia in San Francisco https://t.co/XXp1zz198t@consulrussiaSF pic.twitter.com/z3OVd3dV5S — MFA Russia 🇷🇺 (@mfa_russia) September 2, 2017

Black smoke was reportedly seen billowing from the Russian consulate in San Francisco on Friday, and firefighters confirmed that the occupants were burning unidentified items in the fireplace. Later that same day it was reported that Russian staff could be seen burning papers at the building in D.C. too.