CHICAGO (AP) — Muslim mosques in and around Chicago report receiving threats in the wake of the weekend shootings in an Orlando nightclub that left 49 people dead.

As a result of the threats, Hani Atassi of the Mecca Center in Willowbrook says the center is reinstalling a security fence around the facility. Atassi says the barrier was removed two weeks ago. However, hostile emails and “a lot of fearful members of our community” have prompted its return.

Council of Islamic Organizations of Greater Chicago chairman Mohammed Kaiseruddin and others offered condolences to those killed by Omar Mateen. The 29-year-old U.S. citizen professed his allegiance to the Islamic State in calls to 911 during the attack at Pulse nightclub.

Kaiseruddin said the emailed threats resulting from the shooting early Sunday were forwarded to the FBI.