New details about an “horrific” highway crash that killed two men and critically injured a child and woman have been revealed by police. Major Crash detectives are investigating the cause of a head-on collision on the North West Coastal Hwy at Hamelin Pool, near Shark Bay in WA, on Monday morning. A 12-year-old boy and a woman in her 50s, both passengers in the RAM, were critically injured in the crash. Emergency services at the scene of the fatal crash on North West Coastal Highway north of Perth. Credit: 7NEWSA stretch of highway between Overlander Roadhouse and Billabong Roadhouse remained closed on Tuesday morning, but has been opened up with a 40km/h speed reduction in place, according to Main Roads WA.