Law enforcement said that the gunman in Monday's July 4 parade shooting in Highland Park, Illinois, considered carrying out another attack in Madison, Wisconsin, with an additional weapon he had in his car.
"Investigators did develop some information that it appears when he drove to Madison, he was driving around, however, he did see a celebration that was occurring in Madison, and he seriously contemplated using the firearm he had in his vehicle to commit another shooting in Madison," said Christopher Covelli of the Lake County Sheriff's Office.
The shooter, Robert E. Crimo III, had approximately 60 rounds of ammunition in his car, Covelli said.
"We don't have information to suggest he planned to drive to Madison initially to commit another attack. We do believe he was driving around following the first attack and saw the celebration," Covelli said.
"Indications are that he hadn't put enough thought or research into it," Covelli added.
According to Covelli, the shooter's cell phone — which was dumped in Middleton, Wisconsin — was recovered by the FBI on Tuesday and is being processed now.
Covelli said he didn’t want to speculate on motives, saying, “his motivation isn't necessarily clear.”
“I don't want to go specifically into what he told investigators, however, he had some type of affinity towards the number four and seven and inverse was seven, four,” the deputy chief said. According to Covelli, the shooter's affinity “comes from music that he's interested in.”
Covelli said Crimo will now go through the intake process at the Lake County Jail, where they will go through a number of criteria questions and he'll be classified on where he should be placed within the jail.
“Depending on how those questions turn up, he might be placed in an individual cell. That's something that the jail will work on and they go through their internal process,” Covelli added.
CNN’s Rebekah Riess contributed reporting to this post.