What to know

• Pc Tom Clough, 38, was one of two officers killed when a car driving against traffic on the A66 in Teesside crashed into their police vehicle.S1
• Pc Tom Clough, 38, died alongside Pc Matthew Blades, 37, when a Volkswagen Passat drove against traffic on the A66 in Teesside and struck their armed response vehicleS2
• Five males aged between 17 and 23 years were also killed when their Volkswagen Passat hit the marked armed response vehicle in Teesside.S3
• PC Tom Clough and his colleague were killed along with five others when a car crashed into them.S4