KAIROUAN, Tunisia (AP) — Around 11,000 police officers and soldiers blocked an annual conference Sunday at Tunisia’s main religious center by a radical Islamist movement that has been implicated in attacks across the country, prompting clashes with angry youths that resulted in one death.

Security checkpoints were in place and patrols conducted throughout the central city of Kairouan after authorities declared the conference to be held there by the ultraconservative Muslim group Ansar al-Shariah a threat “to security and public order.”