Mystery of Arizona highway sniper
US police say thousands of people have contacted them after a spate of highway shootings in the US city of Phoenix.
They are investigating a further four possible sniper attacks.
Eleven attacks have been confirmed over the past two weeks, most of them on Interstate-10.
A teenaged girl was wounded in one of the attacks.
The latest confirmed shooting involved a lorry whose driver reported a bullet hole in the cargo area.
The driver had been making deliveries for hours, and was not sure when or where the truck was shot.
Video journalist: Andrew Webb