(Above) Google Street View of 100 block of West Oak Street, where one of the robberies happened. Newberry Library is at far right. (Click on image to view larger version.)

February 29, 2016 – A semi-automatic handgun was used in two street robberies late at night near River North.

Semi-automatic handguns fire faster. The energy of a fired round advances the next round into position for firing.

In both incidents, three black men approached a victim on the street, produced a black semi-automatic handgun, and demanded property, according to an alert issued on Sunday by Chicago Police Department.

It happened on February 9 near West Oak Street & North Clark Street and on February 21 near West Chicago Avenue & North Franklin Street.

The only other description is that the men are in their late teens to early 20s.