Capitol Police have arrested a suspect in the doxxing of senators and releasing personal information onto the internet.

Jackson A. Cosko, 27, of Washington, D.C., was charged Wednesday with “making public restricted personal information,” witness tampering, unauthorized access of a government computer, identity theft, second degree burglery, unlawful entry and threats in interstate communications.

Cosko is in police custody pending his first appearance, which is scheduled for Thursday at 1:30 p.m. in the U.S. District Court for the District of Columbia, according to U.S. Attorney’s Office spokesperson Bill Miller.

The Capitol Police investigation is ongoing, and Cosko could face additional charges, according to USCP spokesperson Eva Malecki. The case is being prosecuted by the Cyber Crime National Security Sections of the U.S. Attorney’s Office for the District of Columbia.

Cosko was recently an unpaid intern for Texas Democrat Sheila Jackson Lee. He no longer works there and the office is “cooperating with law enforcement.”