UPDATE: 01/04/21 9:49 a.m.
With respect to the incident on Dinwiddie Street, area residents reported feeling their homes shake and some type of odor in the air. The Bomb Squad responded with explosives sniffing K9's, but no evidence has been recovered.
The investigation is ongoing.
Original Post:
The Pittsburgh Bureau of Fire and Pittsburgh Police responded to the 3600 block of Penn Avenue for reports of an IED that was thrown from a moving vehicle just after 9 p.m.
A parked vehicle was damaged. There were no injuries.
The Bomb Squad and the Fire Investigation Unit arrived to process the scene.
Police are also investigating reports of a possible explosion in the 200 block of Dinwiddie Street in the Hill District just after 10:30 p.m. A second Bomb Squad unit is investigating.
In the first incident police are searching for a white pickup truck pictured below. They are still reviewing video footage from the second incident. 
If you have any information on either of these two incidents, please call police headquarters at (412) 323-7800.