"Crocus. We mourn,” the message says.
FC Rostov itself also expressed condolences.
“The Rostov Football Club expresses its deepest condolences to the families and friends of those killed in the terrible tragedy that occurred in Crocus City. We wish health to the victims,” the team’s website says.
Earlier, the Russian Ministry of Culture announced the cancellation of upcoming public and entertainment events.
It was also reported that commentator Viktor Gusev and his wife were present at Crocus City Hall at the time of the shooting.