The FBI on Thursday morning arrested a suspect believed to have planted pipe bombs outside the Republican and Democratic party headquarters prior to the Jan. 6, 2021, Capitol riot, MS NOW reported .

The suspect in custody has been identified as Brian Cole, two senior law enforcement officials told NBC News later Thursday morning.

The arrest is a massive breakthrough in the nearly five-year federal investigation into who placed the bombs, which did not detonate.

The suspect is charged with setting the bombs by the parties' headquarters in Washington, D.C., four people with knowledge of the development told MS NOW.

A law enforcement official said that police have not yet determined a motive, MS NOW reported.

But the suspect has been linked to statements that show support for an

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