Teen movie late 70s to mid 80s?

I have vague memories of a film.

Mainly teen boys who got in fights and trouble. There are two scenes that I remember.

One was:

One mother met her son on the street and asked him to come home with her. She had just bought ice cream. He didn't want to go with her. She coaxed him a bit so he grudgingly started walking with her. She started chatting happily to him. Then he turned around and quickly walked the other way. She called after him but he ignored her. She walked home alone, the ice cream melting from the box.

The other scene:

A building was on fire and children were trapped inside. One of the teen went in to rescue them. He got badly burned.

Later, he was at the hospital and one of his friends came to see him. The burned teen died while the friend was there. The friend, who was distraught, ran out and caused a disturbance at a store. He was either arrested or shot.

Those scenes may have come from two different movies but I remember them being from the same movie. I was pretty young when I saw it on TV.

Can anyone help me identify it please?