The robberies happened about 1:30 a.m. near North Capitol and K streets NE, by Gonzaga College High School, police said.
After the second robbery, police chased the man on foot and put him under arrest. Police recovered a handgun.
A transgender woman also was robbed on the border of NoMa over the weekend, police said.
The thief hit about 5:30 a.m. Saturday on the 1000 block of 3rd Street NE, authorities said. Officers later found the suspect and made an arrest.
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