"The precautions distributed Monday to members of the House and Senate include guidance to use underground tunnels while traveling between chambers in the Capitol and to nearby office buildings during the day. “Members and staff should expect demonstration activity and street closures” to affect access to the Capitol, the House sergeant-at-arms said in a memo".

https://www.msn.com/en-us/news/politics/lawmakers-urged-to-use-tunnels-as-protests-add-to-d-c-risk/ar-BB1csYGS?ocid=msedgdhp

Something about being afraid to walk down the street…