Several tents and other items were destroyed but no one was reported injured Wednesday morning when a fire erupted at a homeless encampment underneath BART tracks in West Oakland, authorities said. It was the second fire at a homeless encampment in three days. Wednesday’s fire started about 4:24 a.m. on the south side of Fifth Street between Market and Brush streets, an area that has a large homeless population. Bright flames and dark smoke could be seen over a wide area, including nearby Interstate 880. Firefighters were able to control the fire quickly. The cause of the fire is under investigation.