FBI Director Christoper Wray suggested efforts from Chinese hackers to infiltrate U.S. infrastructure are motivated by something “even more sinister” than an economic incentive.

Wray spoke at the Vanderbilt Summit on Modern Conflict and Emerging Threats on Thursday to deliver the latest update on Volt Typhoon, a group that, according to the FBI, is sponsored by the Chinese Communist Party. The group has infiltrated water treatment plants, the power grid, oil and natural gas pipelines, and transportation systems, according to Wray, and the FBI assisted in removing these hackers’ malware from hundreds of routers.