UPDATE: RUMOR CORROBORATED by Vice News correspondent Alexis Johnson https://twitter.com/alexisjreports/status/1324098325872783361?s=21
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Alexis Johnson
We were outside of the Pennsylvania Convention Center where the Trump campaign was supposed to hold a presser at 3:30. Instead, the podiums were taken down and we were just alerted that it was moved to the airport 20 min away. No reason given yet
#scanner police likely setting up surveillance grid between 20th, 6th, Arch and Walnut
#skywatch All news media helicopters back at their bases, PPD helicopter just took off from Northeast Airport followed by a plane owned by the Commonwealth of Pennsylvania, still trailing behind it.
#scanner Police reporting that group at city hall organized by Refuse Fascism. Police sending additional units
#skywatch PPD helicopter back NE, FOX back in the air in CC, as well as the Commonwealth Plane now circling City Hall
#scanner police will be sending additional units to Independence Hall area to be prepared for march