AUSTIN (KXAN) – The Austin Police Department is investigating two new rock throwing cases over the holiday weekend.

According to police, the first incident happened at the 8800 block of I-35 at around 2 a.m. Saturday. A rock hit the windshield of an 18-wheeler heading southbound.

Another case happened around 9 a.m. at the 3700 block of I-35 the same day. Police say a small car was hit while driving on the lower deck of the interstate.

These cases happen a few weeks after Patrick Johnson, 59, was arrested for allegedly committing a “lions share” of the rock throwing attacks in the past two years.

No one was injured and police are investigating both cases.