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VIDEO: String of armed robberies occur within one hour in City Heights, Hillcrest

(This article originally appeared HERE on CBS8.com.)

SAN DIEGO -- San Diego police are investigating a string of armed robberies Monday targeting pedestrians.

The first two happened in City Heights around 11 pm Sunday. One was reported on El Cajon Boulevard, while the other happened at 37th Street and Polk Avenue.

The third robbery happened on the sidewalk near Rich's Nightclub in Hillcrest. The fourth robbery was at 1st and Robinson Avenue, also in Hillcrest.

Cell phones and money were stolen.

It is not clear if the robberies all involved the same suspect.

No one was hurt.