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A Burnley teenager, whose family emigrated to New Zealand, has died after being 'mowed down' when a car ploughed into a group of party-goers.

Jane Young, 16, was outside a house party in St Albans, Christchurch, on Saturday, when the incident happened, killing Jane and another girl.

New Zealand police have charged 22-year-old factory worker Lipine Sila with murdering Jane, and Hannah Perkins Rossiter, also 16.

Teenagers at the party said the car was driven at one group, stopped, then accelerated again towards a second group, which included Jane and the other girl.

Eight other teenagers were seriously injured, two critically.

Sila showed no emotion as he made a brief appearance at the Christchurch District Court, where he was remanded in custody without plea to reappear again next Monday.

The public and media galleries were packed for the hearing.

Two people remain critically ill in intensive care at Christchurch Hospital and three are in a serious but stable condition.

Two other victims were treated yesterday, and five people have been discharged from hospital after receiving treatment.

Hundreds of teenagers had gathered at the house, which had signs outside advertising the party during the day.

Witnesses said a fight broke out in the street before someone involved got into a car parked nearby and drove down the wrong side of the street before hitting the partygoers.

"The description from the police present was 'like a war zone'," said Inspector Andy McGregor.

"It was pandemonium. There was broken glass everywhere and yelling and screaming."

One partygoer said he saw the car coming and got out of the way, but others were not so lucky.

"I saw a guy in front of me get hit. My legs are still shaking," he said.

Witness Clayton Jamison said he saw people being thrown in the air after the car hit them.

Police later found a red Honda Integra at the scene of another apparent crash in nearby Westminster Street.

Officers were first called to the birthday party about 8.30pm to remove gatecrashers, said Mr McGregor.

"There were probably 300 people at the party. At that stage there didn't seem to be any disorder out on the street."

Police returned about 10.40pm and were being equipped to go in and break up the increasingly tense gathering, and an extra 200-300 people loitering outside, when the car struck the group in the street.

Under a hail of bottles and stones, about 20 police began moving forward and soon realised people were injured. Paramedics followed police in.

"As they went through to clear the street, that's when they found the injured persons," Mr McGregor said.

"As they are actually still attending to the wounded, people are still throwing bottles at them, probably not realising the gravity of the situation."