One person was killed and nine others were injured Tuesday after a pickup truck going the wrong way on a rural Arizona freeway struck a charter bus head-on, authorities said. The pickup truck burst into flames and the driver was declared dead at the scene of the crash, which occurred about 2:15 p.m. on Interstate 10 in Casa Grande, about 50 miles south of Phoenix. Arizona Department of Public Safety spokesman Bart Graves said authorities received several 911 calls about a driver on the main route from Phoenix to Tucson traveling east in the westbound lanes.