By Tim Hanlon Three people have been killed and one critically injured after a car with five occupants was involved in a road traffic incident. Police were called at 11.26pm on Sunday, 14 April, to reports of a road traffic incident involving a car at Staples Corner retail park. It is not believed that any other vehicle was involved in the incident. This is a breaking news story. Follow us onGoogle News, Flipboard, Apple News, Twitter, Facebook or visit The Mirror homepage.