The two men entered the Shop n Save market on 779 East Evelyn Ave. at 11:12 p.m. wearing black hooded sweatshirts, Mountain View Police Department spokeswoman Liz Wylie said. Their faces were covered, she said, and one had a semi-automatic handgun.
The men demanded money from the store's clerk, who told them to go behind the counter themselves to get it, Wylie said. The robbers then left the store without taking anything and fled the scene via unknown means, she said.
The entire incident lasted about 12 seconds, she said.
There were several other customers in the store during the attempted robbery, Wylie said, but no injuries occurred.
The suspects' identities are currently unknown.