PLEASANTON (CBS SF) — Police in Pleasanton on Tuesday afternoon investigated shots fired in a parking lot at the Stoneridge Shopping Center.

The department tweeted just before 3 p.m. that there was police activity near the shopping center located at 1000 Stoneridge Mall Road.

READ MORE: Bay Area, NorCal Heatwave May Break Records; 'Potentially Life-Threating' Central Valley Temps

Police later clarified that they received reports of shots fired in the area at around 2:21 p.m.

Arriving officers went to the shopping center’s second-story “E” parking lot where they located two vehicles with bullet holes along with several shell casings.

A short time later, officers received information that a subject entered the mall before fleeing through another exit. Officers conducted a search of the shopping center and the surrounding area, but were unable to locate any involved subjects.

Police cordoned off an area of a second story parking lot at the mall during the investigation, according to KPIX reporter Juliette Goodrich, who was at the scene.

READ MORE: 'Why Would Something Like This Happen To Me?' 94-Year-Old Anh 'Peng' Taylor Recovering After Shocking SF Stabbing Attack

Officers cleared the parking lot area while searching for a suspect. No injuries were reported.

Pleasanton police officers were still at the scene as of early Tuesday evening and the investigation is ongoing. Stoneridge Shopping Center remained open for business.

MORE NEWS: Mother Accused Of DUI, Resisting Arrest Following Crash In San Bruno

Anyone who witnessed the incident or may have additional information regarding the case is asked to call the Pleasanton Police Department at (925) 931-5100.