SPRING TWP., Pa. -

Police in Berks County and beyond are looking for the thieves who are breaking into Party City stores.

Investigators say two were hit after-hours on the same night.

"It's a sad thing," said Danielle Mulligan, a shopper at the location in Spring Township, which police say was hit Sunday evening.

Shortly after 11 p.m., the robber(s) forced through a rear entrance at the store in Broadcasting Square, proceeding to cut alarm wires, police said.

Detectives said a fire alarm still sounded, and a "few items" were stolen.

That same evening, police in Lower Paxton Township, Dauphin County, say a Party City was robbed sometime after the store closed at 10 p.m.

Lt. Gary Seefeldt said entry was also forced and alarm wires were cut. He tells 69 News that a floor safe with cash was stolen, along with surveillance technology.

Seefeldt described the crime as "sophisticated" and believes more than one person is involved. However, he said the crimes may not be connected.

According to Seefeldt, the stores could be considered a target during the Halloween season, as they sell costumes and items meant for the holiday.

"I notice they sell out a lot of things around this time," said Mulligan.

"I see a lot of people coming in and out of these places," said Armando Rodriguez, another shopper.

No word at this time on exactly how much was taken from either store.