You may hear it if you own a scanner. Whenever there's a fire, firefighters call for a first alarm, then maybe a second... or even more. But what does it mean? What does each alarm indicate? Basically ...

Crews are working to put out a massive fire that broke out at a commercial building in north Phoenix early Saturday morning.

Multiple emergency crews responded to a first-alarm row home fire in Harrisburg Friday evening. County 911 dispatchers first called out the structure fire, in the area of North 18th and Ethel streets, ...