Police are responding to a serious crash after as many as four cars collided east of Georgina.
York police responded to the call around 4 p.m., in the Lake Ridge Road and Pefferlaw Road area, after multiple vehicles collided in Brock.
A 10-year-old girl is among those injured, Ornge air ambulance service confirmed.
It was not immediately clear how many people were hurt in the crash, but Ornge said there could be up to six patients.
Police say road closures will cause delays for people coming home from cottage country.
