2:30 p.m. (approx.): During a teleconference with Pentagon officials and D.C. officials, including Mayor Muriel Bowser, Christopher Rodriguez, and Robert Contee III, Capitol Police Chief Steven Sund “plead[s]” for immediate backup (via U.S. Senate committee staff report)

2:31 p.m.: The House adjourns and the Senate chamber is evacuated. (via the Wall Street Journal)