Two people robbed a Pizza Guys restaurant in the 1100 block of Sycamore Drive at about 11:15 p.m. Wednesday.
Police sent out a radio bulletin about the robbery, and two security guards at a nearby building heard the report and spotted the suspects.
They gave chase and apprehended the teen, who was pepper-sprayed after resisting the guards, Bias said.
A loaded handgun was found on the path the suspects had traveled during their escape attempt, police said.
Antioch police believe the teen may have been involved in at least two of four other recent robberies in the city, as well as one in Pittsburg.
The earliest robbery occurred at about 1:45 a.m. Friday at a 7-Eleven store on East 18th Street, Bias said.
Another robbery, in which a man was shot, happened at about 8:20 p.m. Friday at the La Sierra Taqueria, located at 901 H St.
The 29-year-old victim was taken to a hospital with gunshot wounds to his upper body and legs, but is expected to survive, Bias said.
A woman answering the phone at the taqueria today, who identified herself as the owner, said the victim is her husband.
She said three young males entered the taqueria, which was closed at the time, and demanded money. At some point a struggle ensued and her husband was shot six times, she said.
Early Wednesday morning, two other robberies happened in Antioch as well as one in Pittsburg.
A Quik Stop gas station on West Tregallas Road in Antioch was robbed at 1:23 a.m., and a 7-Eleven on Loveridge Road in Pittsburg was robbed at about 2:30 a.m.
About 15 minutes later, a 7-Eleven on Buchanan Road in Antioch was robbed.
The 14-year-old boy, whose name has been withheld because of his age, is suspected of being involved in all four robberies on Wednesday, Bias said. Police are investigating whether he may also be tied to the Friday robberies.
The robberies have all involved between two and four juvenile males, Bias said. Police are still trying to identify the other suspects.
Anyone with information about the case is asked to call Detective Mellone at (925) 779-6930.