The suspect allegedly brandished what may have been a handgun during a road rage incident in the area, police said shortly before 11:30 a.m.
Officers found the suspect's vehicle at the Nordstrom department store parking lot located near Sand Hill Road between Vineyard Lane and Arboretum Road, police said.
The store was under a lockdown for precautionary reasons until about 11:45 a.m., according to police.
The suspect is described as an Asian man with a goatee and wearing a dark blue dress shirt with embroidery on the front, according to police.
Officers have safely detained the suspect at the nearby Stanford Hospital. The search is complete and all roadways have re-opened. (1/2)— Palo Alto Police (@PaloAltoPolice) September 27, 2016