On July 5, 2011, about 1021 mountain standard time, a Cessna U206F, N51010, collided with an airport boundary fence after veering off the runway during takeoff from Nogales International Airport, Nogales, Arizona. The pilot/owner was operating the airplane under the provisions of 14 Code of Federal Regulations (CFR) Part 91. The private pilot and one passenger sustained minor injuries; the airplane sustained substantial damage from impact forces. The local cross-country flight was departing en route to Phoenix, Arizona. Visual meteorological conditions prevailed, and no flight plan had been filed. Witnesses reported that the airplane was departing from runway 21. It appeared to yaw after liftoff, and then straightened out. The nose pitched up about 15 degrees, and the airplane stopped climbing. It wallowed in a shallow left turn until it collided with an airport boundary fence. The airplane came to rest in trees about 40 feet from the fence and down a 40-degree slope. The pilot failed to submit a Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1), and declined to provide any information or a statement.