The robberies happened at 530 a.m. December 19 in the 800 block of West Oakdale Avenue, then 90 minutes later in the 500 block of West Briar Place and on December 20 in the 3500 block of North Southport.
In all the cases a man and woman approached female victims from behind, shoved them forcefully to the ground, and robbed them of their purses.
