Corroborating evidence wasn't explained because there is none. The NATO 3 are innocent.
Nonetheless, on June 20, AP headlined "NATO protesters indicted on 11 counts in Chicago, including terror-related and other charges," saying:
A grand jury indicted Brian Church, Jared Chase and Brent Vincent Betterly on 11 counts. They include four terrorism related ones and "half a dozen new charges."
Days before NATO's summit began, they were arrested. Illinois' anti-terrorism statutes were used for the first time. All charges were baseless.
Defense lawyers gave AP the 12 page indictment. It "provides no details about the evidence" because there is none. Church, Chase and Betterly are victims. They committed no crimes. They're bogusly charged.
They face long prison terms if convicted. A July 2 arraignment is scheduled.
On June 20, the National Lawyers Guild Chicago chapter headlined "NLG Uncovers Terrorism Indictments in Chicago NATO Protest Case," saying:
"Eleven charges come without any supporting evidence."
NLG lawyers representing the defendants were initially denied access to charges brought against them. Finally the indictment was obtained. Charges include:
Providing material support for terrorism.
Conspiracy to commit terrorism.
Multiple counts of possession of an incendiary device.
Conspiracy to commit arson.
Solicitation to commit arson.
Two counts of unlawful use of a weapon.