The typically hushed corridors of the Russell Senate Building echoed with noise Monday as protesters, upset by the Senate Republicans’ health care bill, descended on lawmakers’ offices to let their displeasure be known ― part of several such demonstrations around the U.S. Capitol.

An initial crowd estimated at around 100 protesters split into smaller groups once inside the building, with each subgroup seeking out the offices of specific senators, some of whom are positioned to cast critical swing votes on the legislation.

Capitol Police said in a statement they responded to 13 locations in Senate and House office buildings and as of late Monday afternoon had made 80 arrests. The officers “warned the demonstrators to cease and desist with their unlawful demonstration activities,” according to the statement, and those who did not were charged under a law prohibiting “crowding, obstructing, or incommoding.”

A group of around 20 protesters visited the office of Sen. Jeff Flake (R-Ariz.) in the Russell building, where they proceeded to enter and chant against what their signs termed “Trumpcare.” Ten later sat on the floor outside Flake’s office, where they chanted “Kill the bill” and “Flake, where are you?”

Protestors from AZ sit down in front of @JeffFlake's office screaming "Flake where are you?" They're facing arrest. pic.twitter.com/D2orXMztgx — Megan Janetsky (@meganjanetsky) July 10, 2017

LOUD protests against GOP health care bill outside Senate offices right now, this one outside @JeffFlake's office. Arrests appear imminent: pic.twitter.com/n4yZCi4cj4 — Frank Thorp V (@frankthorp) July 10, 2017

Protesters also decamped to the offices of Sens. Richard Burr (R-N.C.), Ted Cruz (R-Texas), Pat Toomey (R-Penn.), Rob Portman (R-Ohio), and Cory Gardner (R-Colo.) where they chanted “Health care is a human right” and “Vote no on this bill,” among other slogans.

Health care sit-in happening right now inside Sen. Rob Portman's Senate office. pic.twitter.com/JLU7B15m3k — Mariam Khan (@MKhan47) July 10, 2017

Anti-GOP health care Protest outside @SenCoryGardner's office now: pic.twitter.com/ZDFHOztJp2 — Frank Thorp V (@frankthorp) July 10, 2017

At one point, concurrent protests were taking place across three floors of the building.

Q: So what was your summer internship on the Hill in DC like?



Thought bubble of Sen. Flake staffer on bottom left: pic.twitter.com/t8HLGeTgaF — Jeff Stein (@JStein_Vox) July 10, 2017

Police encircling Flake and Cruz sit in protesters on either side pic.twitter.com/eFW1xEhUWY — Jeff Stein (@JStein_Vox) July 10, 2017

A group of activists also traveled to the office of House Speaker Paul Ryan (R-Wis.).

Police forcing activists out of Ryan's office. Getting handcuffs ready outside pic.twitter.com/az5xZlv7Po — Jeff Stein (@JStein_Vox) July 10, 2017

This story has been updated with the arrests reported by the U.S. Capitol Police.