Fire investigators are trying to figure out what caused a shed to go up in flames Thursday morning on Alba Street in Mobile. Mobile Fire said the structure is a complete loss. Once firefighters got on scene they quickly were able to get it under control before it could spread to homes nearby. “I saw the garage was up in flames and it was just up so high where I thought it was going to get to that car and that house,” said Chris Bonner who called 911. Mobile Fire said the cause is under investigation. Firefighters are warning people to be careful as the temperature cools down because they tend to see more fires as residents start using space heaters to keep warm.