5:00 PM PT -- We're told the Alex Theatre and area surrounding it has been cleared and no explosives or weapons were found. The 8 PM show will go on as planned.
A summer concert with the Gay Men's Chorus of Los Angeles -- featuring Emmy Award-winning actor Leslie Jordan -- was cut super short after a bomb threat ... TMZ has learned.
Law enforcement sources tell us ... an evacuation was ordered at the Alex Theatre in Glendale, CA right after the show's opening number, because a bomb threat was called into the box office. Jordan -- known for playing Beverly Leslie on "Will & Grace" -- was on stage at the time and got escorted off immediately.
We're told cops have the entire block taped off and bomb-sniffing K9s have shown up to search for any weapons or explosives.
The 2 PM concert has been canceled due to the threat, but we're told if cops can clear the theater in time and ensure everyone's safety ... the 8 PM show will go on.