Detectives from Reactive and Organised Crime are investigating a number of arson attacks on cars in the Banbridge, Portadown and Richhill area over the last few days.
Detectives are investigating a possible link between these incidents and are working to establish a motive.
On Monday, 4 April, a car was set alight at Brookfield Meadows, Banbridge shortly before 10.50pm. At 11.20pm on the same night, two cars were set alight with petrol bombs at College Grange, Portadown.
During the early hours of this morning, a car was set on fire at Elm Park, Richhill.
Police are asking the public to assist their investigation.
Detective Inspector Keith Gawley, explained: “We are looking at a number of incidents within this investigation and piecing together evidence from each scene.
“We want to catch the criminals behind this and need your help in reporting any type of suspicious activity in your area when it occurs.
“If you notice people loitering in the area who are not normally there, if you notice vehicles frequenting your neighbourhood that you have not seen before, if you see people running off or cars driving at speed on your street please phone us straight away.
“The quicker we can respond to incidents the more chance we have of finding those responsible or vital evidence.
“We would like to hear from anyone who noticed any activity in Brookfield Meadows and College Grange on Monday night, 4 April, and anyone who noticed any activity in Elm Park during the early hours of this morning, 6 April.
Anyone who has information that may assist our investigation can contact us on 101, quoting ref: 1325 040416 or 122060416.”
If you prefer to provide information without giving your details you can contact the independent Crimestoppers charity anonymously on 0800 555 111.