Four people were hospitalized Thursday, one with life threatening injuries, after a three vehicle crash in west Boise. The Boise Police Department is now wanting to speak with witnesses to the crash. BPD believes two vehicles drove by the crash soon after it happened, including one pick-up truck. Police are urging anyone who witnessed the crash to call Ada County Dispatch at 208-377-6790. The crash happened around 2:30 p.m. and the cause is still under investigation. Traffic alert: Franklin Road is closed between Cloverdale and Five Mile with limited access for residents. Drivers are urged to find another route.