Mexican radio amateurs provided communication support in late May from a fire scene in a remote area to civil protection authorities in Monterrey, Mexico. Two-member teams of volunteers were flown in via helicopter since May 20, the first day of radio support, when the fire had already been burning for a couple of days. The fire in Pajonal -- about 20 kilometers south of Monterrey -- covered more than 200 acres in rough terrain. Temperatures topped 100 °F.