CNN Tonight with Don Lemon was on air when the telephone threat came in at 10:35 p.m. ET., with Lemon saying he and his guests and crew had to evacuate. "We were evacuated in the middle of my live show," Lemon tweeted. "Bomb threat. We’re running taped programming. NYPD is investigating. Stay tuned. #cnn #nypd" Nearly 90 minutes later, CNN tweeted: "NYPD has given the all clear for employees to return to the building at CNN Headquarters in NY."