Investigators said they have "possible" suspects in custody, but have provided no further information.
The robberies just north of /*USC*/ took place on the 2700 block of Ellendale Place, the 1100 block of West 29th Street and the 2700 block of Hoover Street.
The three male victims were threatened either with a gun or metal bars.
The possible suspects were arrested after a separate robbery Tuesday night in Hollywood.
