On Thursday, Brown's office charged Lilly with attempted second-degree murder and second-degree assault with a risky weapon. They say additional calls described a male outside of a vehicle pointing a gun at a school bus, and that subsequent callers said shots were being fired.
In traffic camera video, the bus appears to be moving as Lilly is walking around, but Chief Deputy Hennepin County Attorney David Brown said the shooting appears unprovoked.
The driver told Lilly he could not get on because a child was onboard, the complaint states.More news: Turkey rescuers pull 5-year-old girl from rubble
Police said 31-year-old Kenneth Lilly fired five shots at the 78-year-old school bus driver who bumped his auto on an icy interstate, hitting him in the head and arm. A student who was sitting in the back of the bus at the time of the shooting was reunited with his family and did not suffer any injuries.
According to the criminal complaint filed on Thursday, the school bus and the suspect's auto made contact on the freeway as the bus was merging onto the snowy road.
Lilly has worked as an armed guard for Brooklyn Center based, Statewide Protective Agency since 2015. A truck between the two vehicles pulled into the next lane and left.More news: Newport County keeper Joe Day misses birth of twins during victory
Afterward, video reportedly shows Lilly walk back toward the driver's side of the bus before calling 911. That's when he steps from his auto and walks back to the school bus and begins shooting into the windshield.
Law enforcement authorities responded to a report of a shooting on the interstate at Chicago Avenue in Minneapolis at 2:14 p.m. Tuesday.
That's when Lilly pulled out a 9mm semi-automatic handgun and started walking toward the front of the bus, according to the criminal complaint.More news: Galaxy Note S Pen might have a camera inside for selfies
Lilly told officers he shot at the driver because he feared for his safety.