VIDEO: A major scrapyard fire has been put out after Phoenix Fire Department and several other agencies worked early Sunday morning to contain it near the I-10 stack. Fire crews were called out to the scene near 22nd Avenue and Willetta Street, south of McDowell Road around 5:45 a.m. Video from the scene showed massive plumes of black smoke over central Phoenix as firefighters worked to put out the flames. Phoenix Fire Capt. Scott Douglas told Arizona’s Family that multiple explosions believed to be caused by magnesium were reported after the fire started. It’s still not yet clear what started the initial blaze. Authorities ultimately upgraded the fire to a fourth alarm, meaning a larger response of firefighters were on the scene. Electricity in the area was cut off as a precaution as Arizona’s Family crews spotted a power pole on fire.