A woman has been rushed to hospital in a critical condition after being mowed down by a cyclist in Sydney’s south this morning.

Police said the woman aged in her 70s was struck by a bicycle at the intersection of Acton Street and Toronto Parade in Sutherland at around 8.45am.

The woman sustained severe head injuries.

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She was rushed to St George Hospital where she remains this afternoon in a critical condition.

The cyclist, a man aged in his 50s, was also taken to the same hospital.

Police said he suffered a broken leg.

A crime scene was established and examined by forensic police.

Investigations into the cause of the crash are continuing.

Anyone who may have witnessed the incident is urged to come forward and contact Crime Stoppers.