The FBI is now leading the investigation into the explosives.
ABC News obtained a photo of one of the two explosives.
The device in the photo ABC News received was found near the Republican National Committee headquarters. The second device was found near the Democratic National Committee headquarters, which is located a couple of blocks away.
Both buildings are a short distance from the U.S. Capitol, where Wednesday's violence took place.
Bomb technicians used water cannons to blast the devices and break them apart, rendering them harmless.
Investigators are now examining what's left of the devices to uncover clues about where the parts came from and who built them.
ATF, U.S. Capitol Police and Metropolitan Police Department are all also involved in the investigation.