Authorities suspect arsonist sparked Ranch2 fire in Azusa, while Lake fire origin remains mystery
First came an argument between two men living in the San Gabriel Riverbed Thursday afternoon, police say, then came a physical altercation. Afterward, one of those men intentionally lit a fire in the riverbed, which then spread into the forest and toward the Mountain Cove community, a foothill housing tract, Azusa police and Los Angeles County fire investigators said.