CHICAGO (CBS) — Palos Park police were warning residents of some recent catalytic converter thefts.

WBBM Newsradio’s Bernie Tafoya reports police said thieves used electric saws to remove the catalytic converters from two vehicles at the Metra station at 123rd Street and 82nd Avenue on Thursday.

Thieves target catalytic converters for the precious metals inside, which can get them $40 to $200 if sold at scrap yards.

Palos Park police suggested people etch their license plate number on their catalytic converters, or have a muffler shop secure them to their vehicle’s frame. They also advised parking as close to a building as you can, on the chance someone might spot thieves and deter them.