Earlier this week 17 people were arrested in connection with the investigation into the crash which killed PC Matthew Blades, 37, and PC Tom Clough, 38, bringing the total number of arrests to 24.
The occupants of the other vehicle, a Passat – Michael Robert Cahill, 23, Jacob Matusiak, 23, Makai Saddington, 18, Theo Rae, 17, and Cole Robert Worthy, 17, also died.
Cleveland Police previously said it was investigating “serious criminal activity”.
Assistant Chief Constable Wayne Fox said the force’s “robust approach” showed its determination to pursue those believed to be “causing serious violence and harm to our communities”.
“Be assured, our relentless pursuit of suspected organised criminals will not waver.
“I want to encourage anyone who believes serious violence and organised crime is taking place in their neighbourhood to report it so we can keep on taking action.”
Earlier today the force said a house fire in which an aunt and her seven-year-old niece were killed was not believed to be connected to the investigation.