Denver’s outdoor warning sirens will sound for three minutes on Wednesday morning as officials test the city’s emergency systems.

DENVER — The Denver Office of Emergency Management will conduct a test of its outdoor warning sirens and wireless emergency alert system Wednesday morning. During the test, which is scheduled for 11 a ...

Denver to test sirens and wireless emergency alert system All 86 outdoor warning sirens will sound for about three minutes, and a test alert will be sent to cell phones within the city.