Russian special forces' officers stand next to the FSB security service's office in Moscow on December 19, 2019. - Gunfire broke out in central Moscow near an office of the FSB security service on DEcember 19, with armed officers seen running through a busy shopping area, Russian media and footage on social media said. Several videos shot from different vantage points pictured armed men running out of the office as gunfire rang out, with some reports saying there were casualties. (Photo by STR / AFP)