Federal agencies had intel that could have prevented Jan. 6 attack but they failed to act on it, committee investigator tells NBC

• Law enforcement agencies could have prevented the Jan. 6 attack, a committee investigator said.
• Tim Heaphy told NBC News that the FBI and DHS had important intel but failed to act on it.
• The Congressional committee investigating the attack downplayed law enforcement's role in the riot.

The Federal Bureau of Investigation, Department of Homeland Security, and several other law enforcement agencies had the intelligence necessary to stop the Jan. 6, 2021 Capitol attack before it ever began but failed to take adequate action in time, according to a top insurrection investigator and former federal prosecutor.