Christopher Lee Cornell -– also known as Raheel Mahrus Ubaydah -– was arrested earlier today on charges of attempting to kill a U.S. government official.

Government documents say the FBI first noticed Cornell after he voiced support for violent “jihad” on a Twitter account.

Further investigation revealed his intent to attack the U.S. Capitol, and he planned to detonate pipe bombs there and open fire on any employees and officials after the bombs went off, according to government documents.

The FBI and Department of Homeland Security issued a bulletin to law enforcement agencies across the country, notifying them of the case.