A South Florida man pleaded guilty on Thursday to obstructing religious freedom for threatening to bomb a mosque.

Dustin Allen Hughes, 26, allegedly made several calls to an emergency contact person for the Jamaat Ul Muttaqeen Mosque in Pembroke Pines, Florida, on May 2 and May 5, according to the Sun Sentinel. In each of the voicemails, Hughes claimed to have a detonator that would be used to annihilate the mosque.

“l am so fed up with you Muslims coming here causing mayhem to Americans, so I am gonna give you a taste of what you give to us,” said Hughes in one voicemail obtained by the Sun Sentinel. “I am going to cause you guys to be screaming Allah, Allah, Allah, Allah.”

Along with the threats, he allegedly said, “you guys are all going to be up in flames after I’m done with you.”

Law enforcement immediately checked the inside and outside of the mosque for bombs. There were no bombs, according to a Friday press release by the Department of Justice. (RELATED: Attacks On Religious Freedom Rise 76 Percent Since 2014)

Hughes could serve up to 20 years in prison, and sentencing will be determined on Sept. 6 in Miami.

FBI Miami Special Agent Robert Lasky said the organization will “work tirelessly” to hold anyone who threatens a group’s religious rights accountable.

“Freedom of religion is a fundamental right for every American,” Lasky said.