The King County Jail in Seattle, Wash. was placed on lockdown Sunday after reports of a riot inside the facility, KCPQ reported.
The Seattle Police Department has been called to the jail to provide backup, according to local reports.
"It sounds like there was a problem with a situation at the jail on the 10th floor," a Seattle police department spokeswoman told the Seattle Times.
Police have closed streets around the jail and traffic is being diverted away from the scene.
KIRO Radio reported that the disturbance began at around 2pm local time and that homemade weapons may have been involved.
There are reports that A SWAT team has entered the building to respond to the riot.