BOSTON (CBS/AP) — Protesters backing President Donald Trump breached the U.S. Capitol on Wednesday in violent clashes with police that forced a delay in the constitutional process to affirm Joe Biden’s victory in the November election.

Former Boston Police Commissioner and WBZ-TV security analyst Ed Davis said he was “disgusted” with the “extremely troubling” developments in Washington, D.C.

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“This is breathtaking in its scope; it’s our worst fear realized,” Davis said. “We’ve been watching a continual drumbeat over the last few months to activate people like this, and tragically it’s worked.”

Trump had urged his supporters to come to Washington to protest Congress’ formal approval of Biden’s win. Several Republican lawmakers have backed his calls, despite there being no evidence of fraud or wrongdoing in the election.

According to Davis, what was said at a rally earlier in the day could be considered as inciting a riot.

“There’s abundant capability of the federal government and the local governments to charge people with criminal activity for pouring gasoline on this fire,” Davis said.

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Both chambers abruptly recessed as dozens of people breached security perimeters at the Capitol and lawmakers inside the House chamber were told to put on gas masks as tear gas was fired in the Rotunda.

Davis, who led Boston police amid the marathon bombings and subsequent manhunt, said America looked like “a third world nation” on Wednesday.

“There needs to be decisive action here, and no one seems to have the wherewithal to clear what is our most sacred political structure in the United States,” he said. “This needs to be stopped.”

Davis said President Trump needs to be removed from office, in order to gain control of the situation in Washington.

“There’s a concept of creating a clear and present danger and I think that’s what we’re looking at right now,” Davis said. “So something needs to happen whether it’s the 25th Amendment or criminal prosecution, we need to move on this.”

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