Charred human remains were found Tuesday in the rubble of a Canoga Park commercial building that housed an apparent drug-processing operation and erupted into flames Monday, while fire officials confirmed that another man who was burned in the blaze died at a hospital. Firefighters sent to the 8400 block of North Canoga Avenue about 12:20 p.m. Monday extinguished the flames in an hour and 15 minutes, according to the Los Angeles Fire Department. The cause of the fire remains under investigation. Paramedics sent to the scene took three men to a hospital with burns. A 28-year-old man died at the hospital, according to Brian Humphrey of the LAFD. The man's name was withheld pending notification of his relatives.