Teen injured with homemade explosive

A teenage boy has been injured in an explosion in the backyard of a NSW home, police say.

Two boys aged 15 and 17 lit what is believed to be a homemade firework near Albion Park, south of Wollongong, on Friday afternoon.

Police say the younger boy was injured after the device exploded and broke into a number of pieces.

He was treated by paramedics for cuts to his leg before being taken to Wollongong Hospital. He has since been released.

No one else was injured.

Police from Lake Illawarra Local Area Command attended the home and spoke with the boys' parents.

Inquiries into the matter are continuing.