More than a £1,000 is being offered as a reward for information leading to the arrests of those responsible for a tyre slashing spree damaging 600 cars.
Thousands of pounds worth of damage was caused in July when six streets in Nuneaton were targeted.
About 70 vehicles were vandalised in Walsgrave earlier this month and 50 more in Whoberley on Tuesday.
Det Ch Insp Tim Godwin, from West Midlands Police says the motive remains a mystery.
Police have stepped up patrols in the Whoberley area as a result of the latest attacks.
Detectives believe the same gang is responsible for the attacks.