The alerts jolted some Floridians out of bed on Thursday, and in homes with multiple cellphones, the sounds created an early morning cacophony.

On social media, Floridians complained about the alert and shared screenshots of their phone screens with the notification, which said: “This is a TEST of the Emergency Alert System. No action required.”

Ms. Collins said that the emergency management agency “was taking the appropriate action to remove the company responsible for submitting the alert this morning.”

The blaring alarms prompted some on social media to explain how to stop getting these notifications, but Florida’s emergency management division urged people not to turn them off, saying such alerts are important for public safety.