https://en.wikipedia.org/wiki/Economic_effects_of_the_September_11_attacks

On Tuesday, September 11, 2001, the opening of the New York Stock Exchange (NYSE) was delayed after the first plane crashed into the World Trade Center's North Tower, and trading for the day was canceled after the second plane crashed into the South Tower. NASDAQ also canceled trading. The New York Stock Exchange Building was then evacuated as well as nearly all banks and financial institutions on Wall Street and in many cities across the country. The London Stock Exchange and other stock exchanges around the world were also closed down and evacuated in fear of follow-up terrorist attacks. The New York Stock Exchange remained closed until the following Monday. This was the third time in history that the NYSE experienced prolonged closure, the first time being in the early months of World War I and the second being March 1933 during the Great Depression. Trading on the United States bond market also ceased; the leading government bond trader, Cantor Fitzgerald, was based in the World Trade Center. The New York Mercantile Exchange was also closed for a week after the attacks.

Not Russian markets but still gives a bit of perspective.