HARTFORD — A convicted armed robber will spend 14 years behind bars for a weeklong crime spree in Fairfield County.

The state’s top federal prosecutor, Deirdre Daly, announced Wednesday that U.S. District Judge Alvin Thompson sentenced 42-year-old Francis Manigault of New York to 168 months in prison followed by five years of supervised release.

Manigault robbed four delis and shops in three days in Bridgeport in June 2015 before taking his show down the road to Stamford. But when he knocked over a grocery store on Stamford’s West Side on July 1 of that year, a quick-thinking patrol commander immediately recognized his signature threat - pulling back the slide of his pistol with one hand before brandishing it sideways like television gangbangers - from a television report of one of his Bridgeport robberies.

“I knew immediately, because that was an unusual thing to do,” Patrol Commander Beth Erickson told Hearst Connecticut Media at the time. “It is unique. If someone was racking the gun back, they had to know there was no bullet in the chamber or the bullet would have ejected.”

Bridgeport and Stamford police and the Federal Bureau of Investigation put their heads together to nab Manigault.

According to Daly’s statement, Stamford police found Manigault on Virgil Street in Stamford shortly after the July 1 robbery while responding to 911 calls “and observed him throwing a handgun on the ground.” They arrested him and recovered a handgun that had been reported stolen out of North Carolina.

Manigault pleaded guilty on Oct. 19, 2015 to two counts of interference with commerce by robbery and one of brandishing a firearm during a violent crime.

A baker’s dozen of felony firearm and robbery charges are also pending against Manigault in state courts, according to court records.

Staff Writer John Nickerson contributed to this report.