French police have detained two brothers in connection with what prosecutors describe as a planned terrorist attack with antisemitic motives.

Authorities discovered a loaded gun, hydrochloric acid, and an Islamic State flag in the suspects' vehicle during the arrest operation, according to prosecutors. The materials suggest the brothers were preparing to carry out an attack.

Prosecutors characterized the alleged plot as both "lethal and antisemitic," indicating the suspects may have been planning to target Jewish individuals or institutions. The presence of the Islamic State flag suggests potential links to or inspiration from the terrorist organization.

The arrests come as France maintains heightened security measures amid ongoing concerns about terrorist threats. French authorities have previously thwarted multiple attack plots and remain vigilant about potential violence targeting religious and ethnic minorities.

Investigators are continuing to examine evidence seized during the operation and are working to determine whether the suspects had additional accomplices or targets. The case highlights ongoing security challenges facing French law enforcement in preventing domestic terrorism.