One person was in custody and three were being sought after three stores in the tri-county area were robbed within 24 hours.

Late Monday night, two men escaped with cash and cigarettes after robbing O & M Grocery on Meeting Street at gunpoint, Charleston police said.

They entered the store shortly before midnight. One placed a pistol to the head of a clerk, police said. The other man walked behind the counter, took $160 from the cash register and grabbed six packs of Newport cigarettes, police said.

The gunman struck the clerk over the head with the pistol before the pair fled. The clerk did not require medical attention, police said.

Police on Tuesday arrested 18-year-old Norman Tiashawn Pringle, also known as "Turtle," of Cambridge Avenue in North Charleston. He is charged with armed robbery, Charleston police spokesman Charles Francis said.

The other robber, who has not been identified, was said to be a black male, between 5 feet 8 inches and 5 feet 10 inches tall, with a skinny build. He was wearing a black T-shirt.

A short time later, about 12:15 a.m. Tuesday, a man walked into the Scotchman store on Johnnie Dodds Boulevard in Mount Pleasant, grabbed a couple of drinks and made his way to the counter. Then he pulled out a silver-colored pistol and demanded money from the cash drawer, Mount Pleasant police said.

The clerk told police she screamed, grabbed the cash drawer and put it on the counter. The robber stuffed the cash into his pockets along with his gun and took off, still carrying the drinks, according to a police report.

The robber was described as black, about 5 feet 9 inches tall and wearing a dark-colored sweatshirt, possibly brown.

Later Tuesday, just before noon, a man fled on a bicycle after robbing a Quick Stop store on Bacons Bridge Road in Summerville.

Dorchester County sheriff's Capt. James Nettles said a man walked into the store, displayed what appeared to be a black handgun and demanded money. The clerk turned over an undisclosed amount of cash and the robber made his escape on a bicycle, Nettles said. The suspect was described as a white male in his 20s. He was wearing a red hoodie and gloves. He also wore a bandanna over his face.

No one was injured during the robbery, Nettles said.

Glenn Smith and Andy Paras contributed to this report.