Tens of thousands march in pro-Kremlin rally to mark Russia's Unity Day

Orthodox believers attend a religious service marking the People's Unity Day inside the Cathedral of the Assumption at Cathedral Square in the Kremlin in Moscow, Russia, Wednesday, Nov. 4, 2015. The People's Unity Day is a public holiday in Russia. (AP Photo/Alexander Zemlianichenko) (The Associated Press)

Russia's Patriarch Kirill conducts a religious service marking the People's Unity Day inside the Cathedral of the Assumption at Cathedral Square in the Kremlin in Moscow, Russia, Wednesday, Nov. 4, 2015. The People's Unity Day is a public holiday in Russia. (AP Photo/Alexander Zemlianichenko) (The Associated Press)

MOSCOW – Tens of thousands are marching in a pro-Kremlin rally in central Moscow to mark Russia's Unity Day.

The celebrations were scrapped in St. Petersburg as Russia's second-largest city mourns the victims of Saturday's plane crash in Egypt that killed 224 people. Authorities in Moscow, however, went ahead with the rally, which culminated in a pop concert on a central street. The organizers opened the concert with a moment of silence for the victims of the crash, most of whom were Russian holidaymakers.

Most of the people attending the rally are believed to be students, public servants and nationalist activists.

Unity Day is a national holiday, commemorating a popular uprising driving Polish occupation forces from Moscow in 1612.