FBI in advance warned of war at the Capitol

According to WaPo, on Jan. 5 FBI Norfolk "issued an explicit warning that extremists were preparing to travel to Washington to commit violence and 'war,'" contradicting their previous claim they had no intelligence it would happen. It was forwarded that day to the DC FBI and  shared "'with all our law enforcement partners' through the joint terrorism task force, which includes the U.S. Capitol Police, the U.S. Park Police, D.C. police, and other federal and local agencies." They reported an online thread that stated:

"Be ready to fight. Congress needs to hear glass breaking, doors being kicked in, and blood from their BLM and Pantifa slave soldiers being spilled. Get violent. Stop calling this a march, or rally, or a protest. Go there ready for war. We get our President or we die. NOTHING else will achieve this goal."

So of course everyone knew this was coming so we need a complete investigation into why it happened and who was responsible.