One man and a youth have been arrested on suspicion of attempted murder after two men were found injured on a path.
The men, aged 16 and 19, are in a critical but stable condition in James Cook University Hospital following the incident at about 01:00 on Thursday.
Police believe three men were on a motorcycle leading from Portrack Lane to Norton Road close to the Tecaz store when an assault took place.
One man, aged 31, and a youth of 16, remain in custody.
A third male, aged 16, received hospital treatment for head and hand injuries and was later released.
Officers have recovered a motorbike in the Roseworth area which is believed to have been ridden by the three males.
A silver Ford Focus, which may have also been involved in the incident, was recovered by officers in the Hardwick area, Cleveland Police said.
