According to investigators, the suspects are using a white U-Haul cargo van to commit the crimes.
At least three cases have been reported between 3:40 a.m. and 5 a.m. this week.
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The first incident was reported on Tuesday.
Police say a woman was walking north on the 12000 block of Academy Road around 4:20 a.m. when four teens robbed her at gunpoint. Police say she was then forced into a white U-Haul van.
One of the suspects then punched her in the face while the driver of the van fired two gunshots in her direction, investigators said.
The second incident was reported an hour later on Tuesday on the 6300 block of Roosevelt Boulevard in Oxford Circle.
A man was inside his vehicle using the TD Bank drive-thru when police say a white U-Haul van pulled up and blocked his exit path.
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"Two offenders exited the U-Haul pointing guns at him. In spite of their demands, he was unable to withdraw money from the ATM," said police in a news release.
The suspects then stole the victim's 2011 black Mercedes Benz.
The third incident was reported around 3:40 a.m. on Thursday.
Police say a man was walking on the 9200 block of Delaware Avenue in Torresdale when the suspects pulled up in a white U-Haul van and forced him into the vehicle at gunpoint.
The victim was reportedly threatened to be killed if he didn't provide money.
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Police say the suspects drove to a convenience store on the 9100 block of Frankford Avenue where the victim withdrew $300. The suspects allegedly attempted to get more money at another ATM but they were unsuccessful.
"The complainant was told to transfer money using a banking app. He called his mother to do so and she sent him an additional $300. His phone was taken and they fled in an unknown direction," said police.
No arrests have been made.
Police are urging residents to be on alert.
"You can certainly be cautious of your surroundings, travel in groups. Obviously, we say, 'If you see something, say something,' call 911. And we want people to be cautious of this white box van operating at night," said Philadelphia Police Inspector Matthew Gillespie.
Police released images of some of the suspects.
Anyone with information is asked to call police at 215-686-TIPS.