A picture is beginning to emerge about the suspect accused of planting two pipe bombs next to Democratic and Republican headquarters on the eve of the 2021 Capitol riot, following his arrest on Thursday.

Neighbors and family members described Brian Cole Jr, 30, as "naive" and a "quiet guy" who often walked a chihuahua in their Washington DC suburb. He also told investigators he thought the 2020 election was "rigged", US media reports say.

Authorities arrested Mr. Cole and charged him with use of an explosive device and attempted malicious destruction with explosive materials. The bombs did not detonate.

Authorities have yet to offer a motive. Mr Cole is scheduled to appear in court on Friday.

Federal agents in armoured vehicles descended upon Mr Cole's family home on Thursday morning, where he lives with his mother and others in Woodbridge, Virginia.