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Chicago police are searching for a crew that committed 10 armed robberies in just 30 minutes Sunday morning.

The rapid string of robberies occurred between 7:20 a.m. and 7:50 a.m. Sunday in the Hermosa and Humboldt Park neighborhoods, police said.

The four attackers drove a gray Hyundai Elantra and wore black hooded sweatshirts and black ski masks. They approached victims on the sidewalk or while parking their car, then demanded victims’ property while brandishing semi-automatic handguns, police said.

Police warned people in the area to be vigilant in a news release Sunday afternoon and encouraged anyone with information about the attackers or their car to contact the Police Department’s detectives bureau at 312-746-7394.

Here are the locations and times police reported for each attack:

3900 block of West North Avenue at 7:20 a.m.

3900 block of West Le Moyne Street at 7:30 a.m.

1800 block of North Kedvale Avenue at 7:32 a.m.

4100 block of West Wabansia Avenue at 7:34 a.m.

4400 block of West Palmer Street at 7:35 a.m.

4400 block of West Palmer Street at 7:37 a.m.

4300 block of West Dickens Avenue at 7:38 a.m.

2200 block of North Kenneth Avenue at 7:40 a.m.

1700 block of North Pulaski Road at 7:41 a.m.

4100 block of West Palmer Street at 7:50 a.m.