Potential threats and leads are pouring in to law enforcement agencies nationwide after the insurrection at the US Capitol. The challenge is now figuring out what's real and what's just noise.
Investigators are combing through a mountain of online posts, street surveillance and other intelligence, including information that suggests mobs could try to storm the Capitol again and threats to kill some members of Congress.
Security is being tightened from coast to coast. Thousands of National Guard troops are guarding the Capitol ahead of President-elect Joe Biden's inauguration. Governors and lawmakers are stepping up protections at statehouses after an FBI bulletin this week warned of threats to legislative sessions and other inaugural ceremonies.
A primary concern is the safety of members of Congress, particularly when they are travelling through airports.
The FBI and other federal authorities use their substantial resources to prepare. But smaller local police departments lack the staff to hunt down every tip. They must rely heavily on state and federal assessments to inform their work.
A day before the deadly attack on the Capitol, the FBI sent an intelligence bulletin warning of potential violence to other agencies, including the Capitol Police. But officials either did not receive it or ignored it - and instead prepared for a free-speech protest, not a riot. It took nearly two hours for reinforcements to arrive to help disperse the mob. Five people died, including a Capitol officer.
