A U.S. House committee on Wednesday asked the CEOs of Discord, Steam, Amazon-owned Twitch, and Reddit to testify at an Oct. 8 hearing on the radicalization of some online forum users.

Representative James Comer, chair of the U.S. House of Representatives Oversight and Government Reform Committee, said he was calling the hearing after the assassination of Charlie Kirk. “In the wake of this tragedy, and amid other acts of politically motivated violence, Congress has a duty to oversee the online platforms that radicals have used to advance political violence,” Comer said.

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(Reporting by David Shepardson)