Westpac Rescue Helicopter Service transports two girls, aged 7 and 10, from Merriwa to John Hunter Hospital

TWO children have been flown to the John Hunter Hospital following a quad bike accident in the Upper Hunter on Saturday.

The Westpac Rescue Helicopter Service (WRHS) was tasked to the Merriwa District Hospital about 4pm.

"The girls, believed to be aged seven and 10, were admitted to the facility with injuries after the quad bike they were riding on rolled," WRHS community liaison officer Graham Nickisson said in a media statement.

"Hospital staff and the WRHS critical care medical team stabilised them.

"They were then transported to Newcastle, each in a stable condition - the younger girl with a possible broken arm and the older one with minor injuries."