Plano police are stepping up patrols after more than 100 car burglaries so far this year.
Police have made arrests, but cars continue to be burglarized in the daytime in parking lots across the city. The thieves scope out parking lots and bust in when someone leaves her purse in her car.
Investigators believe a nationwide crime organization dubbed the Felony Lane Gang is responsible.
"This is a large group," Plano police spokesman David Tilly said. "They come from all over the place and continue to send people."
Police are patrolling parking lots more frequently and posting signs. Officers are even leaving purses inside decoy cars
"We are going to have to stay one step ahead of them to get this problem solved," Tilley said.
Violet Parker, who hits the gym at the Carpenter Park Recreation Center almost every day, said she now pays close attention to the signs outside and changes her routine.
"Well, I guess now I will go home and drop off my valuables and come with just what I need," she said.
"For years, I have been out here -- 20 years, never a problem," Keith Geiger said. "Now it has become a problem."