Authorities said a Buick Regal was found surrounded by the remains of the bell and a Hyundai Sonata was found several feet into the front hallway of Hobart High School, the Gary (Ind.) Post-Tribune reported Tuesday.
"Whoever did this, it was completely deliberate. They weren't just driving down the road," said police spokesman Lt. Steve Houck.
Security cameras at the school recorded the vandals crashing into the north entrance twice before they were able to break through the metal and glass doorway.
Houck said both cars had previously been reported stolen.
"It's very disappointing that someone would be so reckless as to damage anything at the school," Principal David Spitzer said.