Mr. Bolton found that the agency’s leaders failed to adequately prepare despite explicit warnings that pro-Trump extremists posed a threat to law enforcement and civilians and that the police used defective protective equipment. He also found that the leaders ordered their Civil Disturbance Unit to refrain from using its most powerful crowd-control tools — like stun grenades — to put down the onslaught... Three days before the siege, a Capitol Police intelligence assessment warned of violence from supporters of President Donald J. Trump who believed his false claims that the election had been stolen. Some had even posted a map of the Capitol complex’s tunnel system on pro-Trump message boards. “Unlike previous postelection protests, the targets of the pro-Trump supporters are not necessarily the counterprotesters as they were previously, but rather Congress itself is the target on the 6th,” the threat assessment said, according to the inspector general’s report. “Stop the Steal’s propensity to attract white supremacists, militia members, and others who actively promote violence may lead to a significantly dangerous situation for law enforcement and the general public alike.”... “Heavier, less-lethal weapons,” including stun grenades, “were not used that day because of orders from leadership,” Mr. Bolton wrote. Officials on duty on Jan. 6 told him that such equipment could have helped the police to “push back the rioters.”