Three masked men, one of them armed with a rifle or shotgun, robbed a 7-Eleven in midtown Palo Alto early Monday morning, police said.
A clerk was also allegedly punched in the face by the gun-toting man.
Police were called to the convenience store at 708 Colorado Ave. at about 2:20 a.m., just moments after the robbery. Officers searched the area for the suspects but could not find them.
This is the second time the 7-Eleven has been robbed by a masked and armed man since June 12. That case remains unsolved and detectives did not know Tuesday whether the two crimes were related.
During the most recent holdup, one of the three men pointed a "long-barreled" firearm at the clerk and demanded money, police said. The clerk, a man in his 40s and the only other person in the convenience store, handed over an undisclosed amount of cash from the register.
The take apparently wasn't enough for the armed man, who punched the clerk and took his wallet, police said. The other suspects, meanwhile, pocketed miscellaneous items. The trio then ran out of the 7-Eleven.
The clerk suffered minor injuries to his nose and mouth, police said.
Police described the man with the firearm as about 6 feet 3 inches and 270 pounds. He was wearing a white mask, a black hooded sweatshirt, blue jeans and black gloves at the time of the robbery.
The second suspect was about 5 feet 11 inches and 180 pounds. He was wearing a white mask, a black hooded sweatshirt with white stripes on the sleeves and shoulders, black pants and black gloves.
The third suspect was light-skinned, about 5 feet 8 inches and 180 pounds. He was wearing a black mask, a gray jacket and black pants.
No suspect vehicles were seen, police said.
Because the masks obscured the faces of the three men, no suspect sketches will be forthcoming, police said. No surveillance images were available for public release Tuesday.
Anyone with information about Monday's armed robbery or the one in June is asked to call the Palo Alto Police Department's 24-hour dispatch center at 650-329-2413. Tipsters who wish to remain anonymous can text or call 650-383-8984, or email firstname.lastname@example.org.