AUSTIN, Texas - Four protesters were arrested after refusing to leave the Texas Capitol grounds Monday night. According to Texas DPS, on August 18, the Texas State Senate adjourned at 10 p.m. and all visitors were told the Texas Capitol building would be closing at 10:30 p.m.

The Texas Capitol building in Austin was partly evacuated on Tuesday amid an active shooter alert. Several state representatives and local media outlets posted videos from the scene, showing chaos. Officers could be seen escorting people off the campus.

The potential court challenge would argue HB 4 amounts to unconstitutional gerrymandering, silencing minority and Democratic voters in Texas.

Collier is among the Texas House Democrats who broke quorum to block mid-decade congressional redistricting. She and at least 51 other lawmakers left the Capitol to block a map that opponents say would disenfranchise voters and position Republicans to gain five seats in Congress.

The parents of Camp Mystic flood victims delivered emotional testimonies before the Texas Senate Committee on Disaster Preparedness and Flooding on Tuesday, urging lawmakers to pass Senate Bill 1.

Shortly after, a protest formed inside the Capitol with chants in support of Collier, including four women sitting outside the doors of the chamber Monday night surrounded by dozens of Texas DPS officers. An officer told them, "If you do not leave, you're subject to arrest for trespassing," and then they were handcuffed and taken into custody.

Democratic Texas state Rep. Nicole Collier spent the night on the Texas House floor in protest after refusing a Republican demand to be placed under the watch of the state Department of Public Safety.