The suspect who allegedly attacked a group of pro-hostage demonstrators in Boulder, Colorado, planned the attack for a year and wanted to kill “all Zionist people,” according to an affidavit filed in a federal court in Colorado on Monday.

The suspect, Mohammed Sabry Soliman, 45, is charged with attacking the rally on Sunday with a homemade flamethrower and Molotov cocktails, wounding eight. He was arrested at the scene of the attack.

Police said Sunday night that one of the victims was in critical condition, and two suffered burn injuries severe enough that they were airlifted to a Denver hospital for treatment.

The police department said on Monday morning that the suspect was being held on a preliminary charge of murder, though none of the victims had died.

The affidavit, filed by an FBI agent in the US District Court of Colorado, was based on Soliman’s interview with law enforcement after the arrest. The filing sought to charge Soliman with a federal hate crime.

The agent said Soliman threw two lit Molotov cocktails into the hostage rally while shouting “Free Palestine.” The firebombs ignited in the crowd, causing burn injuries to eight of the participants.

After he was arrested, a black plastic container with a yellow lid was found nearby. Inside were at least fourteen unlit Molotov cocktails made of glass wine bottles or Ball jars with gasoline inside and red rags hanging out of the top.

Also nearby was a “backpack weed sprayer” loaded with gasoline. Authorities have said Soliman used a “makeshift flamethrower” during the attack.