From lds.org today:
"Two missionaries were killed and another was injured when a vehicle struck all three while they were riding their bikes in Donna, Texas Tuesday evening. Elder Trevor Reinhold Strong, 21, of Taylorsville, Utah and Elder Derek Jason Walker, 20, of Fairfield, Idaho were killed. Elder Zachary Todd Harris, 19, of Huntsville, Alabama was rushed to a nearby medical center, but has now been released from the hospital."
A related story:
Here is another story from Texas about missionaries on bikes being purposefully sideswiped by a car, written Oct. 21, 2011 (I have no idea if these were in the same mission as the deceased missionaries):
"When the driver had both elders in his view in the front right side of his truck, he accelerated. He picked up Elder Smith (still on his bike) and carried him on the grill of the truck about 50 feet. The initial impact slammed Elder Smith's helmeted head against the hood of the truck. When the truck stopped and Elder Smith came down, the truck ran over his bike and (miraculously!) only Elder Smith's foot was still caught with the bike. Somehow, Elder Smith was able to fall backward to keep most of his body from being run over, but by doing so, his head took another blow against the pavement. The truck sped away."
This makes me sick that in two separate instances, it looks like people are purposefully trying to injure or kill Mormon missionaries.