Pipe bombs were planted at the Republican and Democratic Party headquarters ahead of the January 6 riot.
The devices were discovered around 1 p.m. local time on January 6.
The FBI is offering $100,000 for info that could lead to an arrest; new video of the suspect was released.
The FBI released new footage Wednesday of a person suspected of planting explosive devices in Washington, DC, hours before the January 6 insurrection at the US Capitol.
In the footage, a person wearing jeans and a hoodie can be sitting walking up to and sitting down on a park bench while carrying a bag. The FBI said the footage comes "from along the suspect's route" in Capitol Hill, where the bureau suspects they placed pipe bombs at the offices of the Democratic National Committee and the Republican National Committee.
The bombs, which were placed the night of January 5, were discovered the next day at around 1 p.m. local time.
"The FBI has conducted more than 800 interviews, collected more than 23,000 video files, and assessed more than 300 tips related to this investigation," the bureau said in a statement.
The FBI has previously said that an "unknown individual wore a face mask, a grey hooded sweatshirt, and black and light grey Nike Air Max Speed Turf shoes with a yellow logo."
The bureau is offering a $100,000 reward for tips.
At least 638 people have already been charged in connection with the January 6 insurrection, when a mob incited by former President Donald Trump sought to block Congress from certifying President Joe Biden's victory in the 2020 election.
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