Alexandros Paporakis, of Palatine, is accused of driving to the temple intending to shoot people. Court records say the rifle he brought malfunctioned, and he returned home. Investigators allege he then searched online for ways to fix the weapon and told a coworker he intended to carry out a mass shooting. The coworker contacted police, and Paporakis was arrested before he could return, according to sources familiar with the case.

Authorities say a search of the home turned up a modified AR-style rifle, about 300 rounds of ammunition, body armor, gasoline cans and swastika symbols. Investigators also allege they found writings describing hatred toward Indian people and other nonwhite groups and expressing fantasies of mass violence.

Paporakis faces gun charges and is accused of making a terrorist threat. A Cook County judge ordered him held without bond. His public defender has said police and prosecutors’ statements are allegations that may change as the investigation proceeds.

The Palatine Police Department and members of the FBI’s Chicago field office are scheduled to hold a news conference at 10 a.m. Thursday. The temple’s chairman said the place of worship has substantial security measures and praised suburban police for stopping the alleged threat.

The case has raised concerns about the safety of a local religious community. The allegations have not been proven in court.