Arsonists have torched two cars just weeks after a similar attack gutted four other vehicles on the same Leeds estate.
Police are stepping up patrols in the area in a bid to catch he firebugs but say they still need help from local residents who might know those responsible.
The latest incidents saw two cars set alight in the space of two days.
The first arson attack took place on Monday, August 27, between 11.30pm and 11.50pm.
A red Vauxhall Corsa was parked in a car park off Cottingley Vale and at the rear of Cottingley Heights when it was set alight.
The car is expected to be an insurance write-off after suffering substantial fire damage to the front
In the second attack this week, another red Vauxhall Corsa, was set alight on Wednesday at around 4.30am on Wednesday, August 29, as it was parked on Cottingley Drive.
Detectives say the arsonists are believed to have used rubbish to ignite a fire by the one of the vehicle’s wheels which then spread to the car.
Earlier this month on Friday August 3 four vehicles were burnt out in the area surrounding Dulverton Gardens in a spate of arsons that detectives said they were linking.
Three cars – a silver Ford Ka, a green Ford Fiesta and a red Fiesta – were burnt out in the early hours of Aug 3 and a fourth car was then attacked that night.
In the early hours of Saturday, Aug 4, a dustbin was also set on fire in the bin cupboard of a home.
Inspector Paul Akerman, who leads the Holbeck Neighbourhood Policing Team, said: “We have significantly increased our overnight patrols in the area but we still need local residents to help us catch those responsible.
“With the frequency of these incidents I believe local people will have suspicions about who may be responsible or may have seen something they consider potentially suspicious.
“I would ask these people to get in touch with us so we can bring those who believe it’s acceptable to destroy other people’s property before the courts.”
Anyone with information, contact the Holbeck Neighbourhood Policing Team on 101 or call Crimestoppers on 0800 555 111.