MISSOULA, Mont. (AP) — Four people have been killed and two children injured in a head-on collision on Interstate 90 in western Montana. The Montana Highway Patrol reports that a 45-year-old Spokane, Washington man suspected of being under the influence was traveling the wrong way on the interstate on Saturday evening near Whitehall. He struck a vehicle carrying two adults and three children from Hartford, South Dakota. The Spokane man, a 37-year-old woman, a 32-year-old man and a 14-year-old girl were killed.