The comedian’s 71-year-old mother was rushed to hospital after being badly injured in a hit-and-run car crash.
The stars mother, Barbara Brand was in the back of the comedian's chauffeur-driven Audi A8 when it was involved in a crash with a Vauxhall Astra in Essex, on Thursday morning.
The chauffeur, in his 40s, was also hurt in the crash and taken to hospital for treatment.
Essex Police told The Sun that their injuries were not believed to be life-threatening.
The spokesperson added that officers were searching for the driver of the Astra, who had fled the scene.
Brand cancelled a gig in Scotland on Thursday night, citing a "personal emergency" as he reportedly rushed to his mother's bedside.
"Due to a personal emergency Russell's promoters regrettably announce the postponement of Russell's tour date at His Majesty's Theatre in Aberdeen," a statement on the theatre's website said.
"Please keep hold of your tickets. Tickets holders will be contacted about the rescheduling of the show very soon.
"We realise this will cause huge disappointment but we will do everything we can to reschedule the date and will be in touch with you soon."
Essex Police told The Sun: "The Audi driver and passenger, a man in his 40s and woman in her 70s, were taken to hospital with injuries not believed to be life-threatening.
"The occupant of the Astra had left the scene. Inquiries are ongoing to locate them."