A BRITISH father and son have been killed in a rock slide on holiday in Australia. The boy’s mother and brother were critically hurt in the freak accident after the family went hiking in the Blue Mountains north of Sydney. Rescuers used a helicopter to reach the victims in Australia’s Blue Mountains Police said the family were all British nationals who were visiting from the UK. The dad, 49, and son, aged nine, died at the scene while the mum, 50, and another boy aged 14 were airlifted to hospital in a critical condition. A third child, a daughter aged 15, escaped serious injury in the landslip at the Wentworth Pass in Wentworth Falls. Acting Superintendent John Nelson said the victims were crushed by falling rocks. Most read in News SHOT DOWN Wreck of Russia's newest £38m fighter jet burns after being blasted out the sky SLAUGHTERED Ukraine mayor 'executed by Russians alongside family & dumped in shallow grave' ONE PUNCH KNOCKOUT Baby-faced teen punched man unconscious - but is CLEARED of his death NOT WELCOME I'm a Ukrainian refugee & was sent creepy messages while looking for room in UK BUTCHERS OF BUCHA Russia 'worse than ISIS' after executing more than 400 in 'genocide' MENTAL STRAIN Tory MP in hospital for ‘severe shock & stress’ after cocaine scandal pic He told local media: “There were five people that were bushwalking. “Unfortunately there has been a landslip while they have been bushwalking. “As a result of that there has been a police operation that is in process as we speak. That is a rescue and recovery operation. “Unfortunately, today as part of that landslide there has been a man and a boy who have passed away.”