With one Fairfield man already arrested, Norwalk police searched Wednesday for another man and two women who used a gun to kidnap and rob a Citgo gas station clerk a day earlier.

Arrested about 90 minutes after the robbery and kidnapping of the store clerk was Darin Mann, 40, of 200 Reef Road, Fairfield.

Mann is charged with first-degree robbery, first-degree kidnapping, first-degree kidnapping with a firearm, and conspiracy to commit first-degree robbery. He was held in lieu of $500,000 bond for arraignment later in Norwalk Superior Court, where the case is likely to be transferred to the Stamford courthouse.

The nighttime cashier at the Citgo station on East Avenue in Norwalk went outside to use a restroom about 1 a.m. Tuesday when he was shoved into a car at gunpoint, according to the day clerk at the 24-hour station and convenience store

Clerk Viral Solanski said the robbers, accompanied by two women, may have been lying in wait for the clerk to take his nightly break.

After the woman pointed the gun at the clerk and ordered him into the back seat, the victim was driven around for about 10 minutes while his possessions, including about $200 in cash, were taken, Solanski said.

The group then drove the clerk back to the station after he was told to give them a key to the front door of the store, Solanski said.

But the robbers did not know that the clerk slipped the real front door key into his boot while they were driving and turned over to his captors a different key.

Back at the gas station -- after a woman fueled up at the pumps -- one of the men tried to use the key to get into the store.

At that moment, the clerk made his escape and ran north on East Avenue before cutting through an East Norwalk neighborhood and walked back to his home, where he called a friend who called police, Solanski said.