The man held by police in connection with the mass shooting at a July Fourth parade planned the attack for weeks — and dressed like woman to avoid detection, authorities said Tuesday.

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What was supposed to be a day of national celebration turned into a day of tragedy and fear when a gunman killed seven people and injured dozens of others at a July Fourth parade in Highland Park, Illinois.

Schools, churches, grocery stores and now community parades have all become killing grounds in recent months.

"These are just the first of many charges that will be filed against Mr. Crimo," said Lake County State's Attorney Eric Rinehart.