A total of 50 people have now been arrested as part of a wider police operation against organised crime following the fatal crash, Cleveland Police said. Ten of those arrested are alleged to be linked to the Volvo reportedly involved in driving into two properties in the early hours of 22 August.
Det Ch Sup Helen Barker of Cleveland Police said: "Over the last two months, we have identified 50 people who we believe are associated within criminal networks that seek to cause serious violence and harm within the community through the supply of drugs."
The force said shotguns, hand guns, machetes and ammunition had been seized, along with £60,000 worth of class A and B drugs and more than £30,000 in cash. Safeguarding interventions have also been made in relation to three children.
The crash happened on 22 August, when a Volkswagen Passat carrying five young men hit an oncoming marked Cleveland Police vehicle on the dual carriageway near Middlesbrough at about 03:39 BST. Officers PC Matthew Blades, 37, and PC Tom Clough, 38, died at the scene. The occupants of the Passat, which was travelling the wrong way down the A66 at South Bank, also died: Michael Robert Cahill, 23, Jakub Matusiak, 23, Makai Saddington, 18, and 17-year-olds Theo Rae and Cole Robert Worthy.
A number of those arrested have been charged with various offences, and the police operation remains ongoing.
Barker said: "Our pursuit of this criminality will continue, and I want to take this opportunity to thank the community for their support and patience but also for the information that we keep receiving. I want to encourage you to keep on reporting behaviour that is related to drugs or organised crime - no matter how small - and be assured we will act."