A Republican-led conference opposing Donald Trump was forced to evacuate Sunday due to a bomb threat at the Washington, D.C., hotel hosting the event. Attendees at the Principles First Summit were forced out of the JW Marriott hotel after receiving the threat from someone claiming to be former Proud Boys leader Enrique Tarrio.

The Principles First summit in DC — dubbed by some as the “Anti-Trump CPAC” — was interrupted by a bomb threat Sunday. The threat to the event came from an online poster with the moniker “Enrique T” — similar to the name of the ex-leader of the notorious Proud Boys,