Police today announced the arrest of Kadeem Cook, 18, of the 200 block of West Champlost Street in Olney. He's the man who police said robbed a woman at gunpoint Wednesday night while she was walking along the 1000 block of Nedro Avenue, taking her purse and cell phone.

Police said the robber then used the woman's cell phone to take photos of himself holding the gun used in the robbery.

But the victim had rigged her phone to automatically transmit images to her home computer. She contacted police, who distributed copies of the photo, which shows Cook mugging with the gun, pointing it to his head.

After seeing his photo widely disseminated, Cook thought it best to surrender to police, which he did about 11:30 p.m. Thursday at Northwest Detective Division. The gun he used turned out to be a pellet gun.

He was charged with armed robbery and other offenses. Police said he is believed to have pulled another robbery in the same area, the 1000 block of Nedro.