A teenage boy was killed after a motorbike he was riding with an 18-year-old man collided with a garden wall.
Police were called to the scene in Redcar at around midnight last night to reports of an incident.
A 16-year-old was declared dead at the scene while an 18-year-old was rushed to hospital with serious head injuries.
He is receiving treatment at James Cook University Hospital where police say his condition is critical.
A spokesman for Cleveland Police said: “A teenage boy, 16, has sadly died following a collision on Cotswold Drive in Redcar around midnight this morning, Wednesday 12th October.
“Officers were called to a report of two males on a motorcycle on Cotswold Drive, who appeared to have collided with a garden wall.
“The 16-year-old male was pronounced deceased at the scene. Our thoughts are with his family at this difficult time.
“The second male aged 18 suffered significant head injuries and is receiving treatment at James Cook University Hospital. He is in critical condition.
“Police are appealing for anyone who witnessed the incident or has dashcam footage or CCTV to contact them on 101 quoting 182917.”
Residents told Teesside Live they heard a “loud bang” and later several emergency vehicles arrived on the scene.
They were asked to stay inside their homes while the incident was dealt with.
A spokesman for North East Ambulance Service earlier said: “We received a call at 1.53am this morning to reports of a road traffic incident on Malvern Avenue, Redcar.
“We dispatched two ambulance crews and two specialist paramedics. One patient was then taken to the James Cook University Hospital for further treatment.”