Police are investigating whether a stolen vehicle with two firearms is related to reports of gunshots heard in Austin Saturday morning.

According to the Austin Police Department, the vehicle owner made the report at 7 p.m. Friday and said the 2005 black Pontiac Grand Prix was stolen from the 100 block of 19th Street Northeast, where it was parked overnight.

The owner said the car contained two firearms: a SKS assault rifle and a Taurus .380-caliber pistol. Police have recovered the car, but the firearms are still missing.

According to the report, the car was unlocked with the keys in the center console.

Police then took several reports of gunshots at about 3:20 a.m. Saturday. After speaking with people who heard the gunshots, officers found three shell casings at Mill Pond near the Austin Public Library; however, they found no injured victims or property damage.

Police say the bullets could have been fired from the stolen assault rifle. The case is still under investigation. Police are interviewing suspects and request the public’s help for more information.