Three people are in custody Monday awaiting formal charges after two Dakota Access pipeline protesters rappelled from the roof of the U.S. Bank Stadium in Minneapolis to hang a banner during the Minnesota Vikings‘ season finale against the Chicago Bears.

The game was not interrupted by the protest Sunday, but eight rows of fans seated below the banner were cleared as a precaution. The Vikings beat the Bears 38-10.

The banner urged Minneapolis-based U.S. Bank to divest from the four-state, $3.8 billion pipeline. Opponents contend the pipeline could affect drinking water and Native American artifacts. Texas-based developer Energy Transfer Partners says the pipeline will be safe.

Minneapolis police spokesman Officer Corey Schmidt said a 32-year-old man and 26-year-old woman were arrested Sunday on misdemeanor burglary and trespass charges for the high-flying stunt.

Police also arrested a 27-year-old woman at the stadium Sunday whom they accused of obstructing the legal process. Schmidt said Monday that accusations against the woman have been upgraded to include burglary. He declined to discuss her alleged role in the incident, citing the ongoing investigation.

He said a complaint with formal charges is expected to be filed Tuesday.

The Hennepin County Jail roster shows all three suspects still in custody on Monday.

Minnesota’s burglary law includes entering a building without consent and with the intent to commit a crime. Schmidt said the manner in which the suspects got inside the stadium was part of the ongoing probe.

The protesters rappelled into place during the second quarter, and hung in a seated position about 100 feet above the seats that were evacuated for safety. The pair watched the rest of the game, occasionally shifting positions or waving at spectators. One wore a purple Brett Favre Vikings jersey.

U.S. Bank Stadium operator SMG said in a statement that they apparently climbed over a guard rail to access the ridge truss. Police spoke with them from a catwalk in attempt to get them to stop, and by the fourth quarter about a half-dozen police and firefighters in rappelling gear were on the truss waiting to remove the pair.

The protesters willingly climbed up their ropes when the game ended, as fans booed them from below.

Vikings spokesman Lester Bagley said the team’s only concern was for the “safety of our fans and guests.”

Protesters say U.S. Bank has extended a large credit line to Energy Transfer Partners. U.S. Bank spokesman Dana Ripley declined comment.

The pipeline would carry oil from western North Dakota through South Dakota and Iowa to a shipping point in Illinois. Protesters camped in North Dakota for months to try to stop completion of the project.

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Associated Press reporters Blake Nicholson in Bismarck, North Dakota, and Jeff Baenen in Minneapolis contributed to this report.