The incident occurred at approximately 1:20 p.m. in the parking lot of the Acme, 4720 Limestone Road, as a 50-year-old female from Wilmington was preparing to enter her vehicle. The suspect approached her, grabbed her arm, displayed a knife, and demanded her purse. The victim told him she was going to call 911, and the suspect ran away without the purse. The victim was not injured. If anyone has any information in reference to this incident, they are asked to contact the Robbery Unit at Troop 2 at 302-834-2630 extension 6, or Delaware Crime Stoppers at 1-800-TIP-3333. Information may also be provided via the internet at www.tipsubmit.com. Send an anonymous tip by text to 274637 (CRIMES) using the keyword "DSP."