Staff writers

CONCORD -- Two men have been arrested after investigators linked them to armed robberies at a pet supply store and a UPS office about 15 minutes apart Wednesday night and two similar robberies in the city five days ago, police said.

Concord residents Richard French, 57, and Charles Curry, 50, robbed a Pet Food Express store at 5434 Ygnacio Valley Road about 6:20 p.m. and a UPS store about three-quarters of a mile away at 5100 Clayton Road at 6:35 p.m., according to Concord police Lt. David Hughes.

In both instances, a single robber showed a gun and took an undisclosed amount of cash. Police did not specify each man's role in the robberies.

No one was injured, and a Pet Food Express employee said the store was back to business as usual Thursday.

The robberies came less than a week after two other businesses, a Sally's Beauty Supply shop and a Yogurt Shack, were targeted. Both stores are located in the Clayton Valley Shopping Center. Those robberies occurred about 10 hours apart on Aug. 17.

Early Thursday morning, detectives arrested French in connection with three of the robberies. French was also wanted on a $100,000 felony fraud warrant from another jurisdiction, police said.

Hughes did not say how detectives had linked French to the crimes.

A search of French's residence in the 5400 block of Roundtree Court turned up the gun used in the robberies, as well as additional evidence linking French and Curry to all four crimes, police said.

Police said both men were booked into the County Jail in Martinez and will face four counts of armed robbery. Police said French will also face a charge of being a felon in possession of a firearm and firearm enhancements.

An assistant manager of the Yogurt Shack said store customers and employees didn't seem too unnerved by the three robberies at the Clayton Valley Shopping Center.

"Nah, not really," said Brian Crase, 19, an assistant manager of the store. "I don't feel unsafe. You hope it doesn't happen, obviously, but I think he was more interested in the cash. I don't think he was interested in hurting anybody. At least that didn't happen."

Anyone with information about the crimes is urged to contact Concord police Detective Pardella at 925-603-5922. Those wishing to remain anonymous can call the Concord Police Department tip line at 925-603-5836.

Contact Rick Hurd at rhurd@bayareanewsgroup.com and follow him at Twitter.com/3rderh. Contact Katie Nelson at knelson@bayareanewsgroup.com and follow her at Twitter.com/katienelson210.