Officials say one police car was damaged by a group of suspects in Spring Garden.
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About two hours later, two more police vehicles were damaged after more than 200 cars gathered near Rivers Casino in Fishtown.
"I'm currently surrounded by about 500 to 700 people, can't get out of my vehicle," said one officer.
Investigators say a large crowd of people gathered in Spring Garden for an unauthorized car meeting.
That was near the 400 block of North 5th Street just before 12:30 a.m.
When officers responded to break up the group, police say some people began jumping on the cruiser while others slashed one of the tires.
No one was hurt during this incident.
Later on, officers responded to what they described as an unruly crowd at approximately 2 a.m. on the 1000 block of North Delaware Avenue in Fishtown.
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Police say the crowd surrounded the officers' vehicles and tried to break windows.
"They're kicking my windows out and they're on top of my vehicle," an officer reported. "These guys were slashing tires of police vehicles earlier in the 6th, so officers leave vehicles unattended. Make sure they are aware of that."
One of the vehicles was dented and a mirror was ripped off.
The crowd slashed one of the tires on the other vehicle.
No injuries were reported at the scene. No arrests were made in either incident.
The investigation is ongoing. Police said they are looking into videos posted on social media of the events.