US authorities on Wednesday warned that threats against Muslims would not be tolerated, and possibly prosecuted, after alleged incidents in the wake of the Orlando gay club massacre, which was carried out by a Muslim gunman, AFP reports.

"Civil rights violations are a priority for the FBI," assistant special agent Ron Hopper told reporters. "We will investigate reported incidents against individuals based upon any class, any protected class, to include race, religion, and sexual orientation."

US attorney Lee Bentley chimed in: "Making these threats is not only wrong, in most cases, making these threats is illegal. Stop it. Any threats like this detract from what we're doing in law enforcement."