The Austin man arrested on allegations he was planning a mass shooting on his 50th birthday in April has been indicted by a federal grand jury on a weapons charge.

The U.S. Attorney’s Office said Steven Thomas Boehle is facing a federal charge of possession of a firearm by a prohibited person. Authorities allege Boehle was planning to conduct a mass shooting, and an April 12 search warrant on his residence found three weapons and more than 1,000 rounds of ammunition. Federal agents executed a federal search warrant at an Austin storage unit leased by Boehle, and recovered 10 long guns (rifles and shotguns), the Department of Justice said.

A judge on Monday set Boehle’s bond at $10,000, and the U.S. Attorney's Office says he remains in custody while the U.S. District Court reviews the release order.

If convicted on the firearms charge, Boehle faces up to 10 years in federal prison.