Police say the 21 year old suspect arrested in connection with the July 4th shooting attack on an Independence Day parade in Chicago had planned the assault for weeks.
Robert Crimo is accused of killing 6 people and injuring 30 in the affluent suburb of Highland Park.
The details on the investigation came from `Christopher Cavelli of the Lake County Sherrif's Office.
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Police say Crimo disguised himself in women's clothing during the attack.
A second rifle was found in the car in which he was attempting to escape, along with pistols that were discovered in his home.
He's believed to have fired 70 rounds of ammunition at parade goers.