The building at 1200 Travis houses hundreds of employees at the Houston Police Department.
It's the last place you want to target with a bad joke like blowing it up along with everyone in it.
"We have a specialized division that investigates any threats made against any Houston Police officers, their families or the department," said Gary Blankinship, head of the Houston Police Officers Union.
FOX 26 News has learned that specialized unit and the FBI are now investigating a 911 call that came in to the Houston Emergency Center Sunday night. The caller threatened to blow up the Houston Police Department.
That bomb threat was traced back to Kansas City, Missouri and a group of known pranksters who post their crank calls on the video sharing site YouTube.
Sources said those pranksters make calls around the country using the name of Frank Garrett or Duncan Construction: a real man and company in Oklahoma. Garrett didn't likely have anything to do with the HPD bomb threat because his name has been used by a network of prank callers for years.
"Every threat is taken seriously by the police department," Blankinship said.
Especially in the time following 9-11 and the attacks on America. Whether the suspects meant it as a funny prank or not, investigators are now considering it a crime and launched an investigation.
"It costs the taxpayers a lot of money when people do things like that cuz a lot of mechanisms go into motion when an incident like this occurs," Blankinship said.
We did a check on YoutTbe to see if the HPD bomb threat had been posted by the pranksters. So far that hasn't happened, but their jokes have lead to other investigations reported by our sister station in Kansas City.