Portland police have arrested the man they allege robbed a Rite Aid pharmacy in the city’s West End on Monday morning.

Lt. Robert Martin said officers apprehended Alexander Angelini, 18, of Barrington, Rhode Island, around 4:30 p.m.

“He was arrested in Portland and he cooperated while being taken into custody,” Martin said Monday night.

Martin said the robbery was reported a little after 9:30 a.m. Police were told that a white man in his early 20s had handed the Rite Aid pharmacist a note demanding drugs. He escaped on foot after receiving an unknown quantity of drugs. The pharmacy is located at 713 Congress St.

Martin said police do not yet know the full contents of the note or whether any threats were made. He said that Angelini did not show a weapon during the robbery.

After the robbery, the man was seen headed westbound on Congress Street, according to Martin. Shortly before 10 a.m., a K-9 unit from Scarborough was helping Portland police track the suspect.

Martin said Angelini was wearing a dark coat with a white lining around the collar and a knit cap with black and white stripes and a white pom-pom on top. He was also described as wearing a red and white scarf to conceal his face.

Following his arrest, Angelini was taken to the Cumberland County Jail in Portland, where he was charged with robbery. He was being held at the jail Monday night on $440 cash bail.

Dennis Hoey can be contacted at:

dhoey@pressherald.com

Randy Billings can be contacted at 791-6346 or at:

rbillings@pressherald.com

Twitter: randybillings