SCOTTSDALE, Ariz. — Air tankers and helicopters helped douse flames from the sky as nearly 200 firefighters on the ground battled a wildfire northeast of Phoenix on Friday that threatened scores of homes and forced dozens of residents to evacuate. Authorities expanded the evacuation area in a subdivision on the northeast outskirts of Scottsdale, closed roads and shut down part of a nature preserve as gusty winds continued to fan the flames in extremely hot, dry conditions. But there were no immediate reports of any injuries or structure damage, Arizona fire officials said. Near Phoenix, where the high reached 110 degrees Fahrenheit (43.3 Celsius) on Friday, about 60 residents evacuated homes in the Boulder Heights subdivision overnight after the human-caused fire broke out Thursday. Fire officials said they were investigating exactly what sparked the blaze about 5 miles (8 kilometers) east of Carefree, just outside northern Scottsdale on the edge of the Tonto National Forest.