Emergency services are attending the scene of a car crash involving 11 people in Christchurch, where there are concerns a fight could break out.

The incident between a car and a van happened at 8.15pm on the corner of Ferry Rd and Ensors Rd in Woolston.

A police spokeswoman said police were asked to hurry by ambulance officers due to concerns there could be a fit between occupants of the vehicles.

People became "agitated" at the scene as ambulance crews were treating patients said a St John's spokesman.

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"The situation was a wee bit tense...so we requested police urgently."

The situation was resolved by police.

Eight patients were transported by ambulance to Christchurch hospital with injuries ranging from minor to serious.