OVERLAND PARK, Kan. —  Police were working leads Monday looking for a break that would lead to information regarding the fate of a Kansas teen missing since Saturday.

Meanwhile, the family of 18-year-old Kelsey Smith offered a $5,000 reward for information about her whereabouts.

Police have gotten tips from people who might have seen Smith, who disappeared Saturday night near a shopping mall, said Overland Park Police Capt. Tom Fredrickson. Other tips about a car like hers or a suspicious incident have also come in, but a lot of the leads haven't panned out, he said.

"Please call the Overland Park police or the TIPS Hotline and let us know where she is at," Greg Smith, Kelsey's father, told KMBC-TV. "We just want our baby back, that's all."

Officials are trying to establish Smith's whereabouts between 7:10 p.m., when she left a Target store, and 9:15 p.m., when her vehicle was found parked outside the Macy's at Oak Park Mall.

Smith had run an errand that her family said should have taken 30 minutes. Her cell phone and ATM card were missing from her purse.

Smith recently graduated from Shawnee Mission West High School and had planned to meet her boyfriend at home after the errand to attend a graduation party and go out to dinner.

Smith is 5 feet 6 inches tall and 120 pounds with long brown hair and brown eyes, KMBC-TV reported. Smith last was seen wearing a pink tank top and black shorts, police said.

Anyone with information is asked to call 816-474-TIPS.

The Associated Press contributed to this report.