Three catalytic converter thefts have been reported since November in Lake View and Wrigleyville, police said.
In each case, the suspects used a power saw to cut the catalytic converters from the vehicle during evening and overnight hours, Chicago police said.
The first theft happened at 3:36 p.m. Nov. 28 in the 3100 block of North Honore Street, police said.
Another happened between 6 p.m. Dec. 18 and 5:35 a.m. Dec. 19 in the 3700 block of North Wayne Avenue, and the third was at 3:28 a.m. Dec. 19 in the 3700 block of North Freemont Street.
The suspects are described as two males, police said.
Anyone with information is asked to contact Area North detectives at 312-744-8263.
