Nearly two dozen cars in the Trinity Park area were targeted last month. Police are now stepping up patrols in the neighborhood, even using the Parking Enforcement Unit as an extra set of eyes.
Some of those officers said drivers make it very tempting for criminals.
"Pocketbooks left on the front seats, CD players, books and bookbags -- you never know what's in it until you take it out and go through it," said William Druid of the Parking Enforcement Unit.
Durham bike patrol officers contact owners if they have left their cars unlocked or valuables out in the open. Last year, there were more than 4,000 car break-ins in Durham and about 4,500 in Raleigh.