Charleston police arrested three suspects Tuesday night after three armed robberies were committed downtown within about 90 minutes.

Iris Isabelle Stapen, 19, of Sawgrass Road, is charged with three counts of armed robbery; Christian Phillips Dobson, 21, of Harleston Place, is charged with four counts of armed robbery and three counts of possession of a firearm during the commission of a violent crime; and Tyler Egan Ellis, 19, of Scotia Street in McClellanville, is charged with four counts of armed robbery and two counts of possession of a firearm during the commission of a violent crime.

They were all being held in the Charleston County jail.

The first armed robbery occurred about 7:50 p.m. on Coming Street. A woman was walking when she was approached from behind by two men, one armed with a knife. They grabbed her purse and fled the area in a truck.

The second armed robbery occurred about 9 p.m. near Vanderhorst and Smith streets. A woman was walking toward her car on Smith when she was approached by a man armed with a handgun. The man grabbed her purse from her shoulder and fled.

The third armed robbery occurred about 10 minutes later near Radcliffe Street and Radcliffe Place. Both victims were walking near that intersection when they were approached by two men, one armed with a handgun. The suspects robbed the victims of their purse and wallet.

A description of the suspects and their vehicle was provided to officers. An officer initiated a traffic stop near Meeting and Columbus streets of a vehicle with occupants who matched the description of the suspects. They were taken into custody.