anthony vialerio grew up in the city. loved to surf, fly gliders and bake sour dough bread. neither firefighter had any children, but they leave behind many family members. >> means a lot to us and the outpouring of support from san franciscans have done for us. we have had firefighters coming, delivering pizza and barbecue, anonymously. it's touching. >> it's a fraternity. we put ourselves on the line all the time. when somebody is lost, you feel it. >> they died battling a house fire in diamond heights last week. they got caught in what's called a flashover, a fire that heated up to more than 1000 degrees. the funeral is said to start here in about a half hour and it is expected to last about two hours. we have security on hand as well as dozens of officers from the san francisco police department. the public is welcome to attend although parking is very difficult. you should take mass transit if you would like to come to the funeral. we are live in san francisco, i'm tara moriarty. >>> thousands of people are attending today's funeral for those fallen firefighters and the