BISMARCK -- Troopers arrested about a dozen Dakota Access Pipeline opponents who staged a surprise protest inside the building Thursday, Nov. 3.

The protesters were arrested as they sat in a prayer circle inside the Capitol's east entrance. They were arrested on suspicion of criminal trespass and disorderly conduct. They were led out of the building as they sang. 

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The Capitol's exterior doors were to be locked shortly before 4 p.m., according to an email from a legislator.

Protesters were also gathered in groups outside, including a group of about 50 clergy - many who had visited the protest camp earlier in the day. 

Authorities have made more than 400 protest-related arrests so far linked to protests over the $3.8 billion pipeline, including 141 last Thursday as hundreds of officers using pepper spray, bean bag rounds and other less-than-lethal tactics evicted protesters from their camp on the pipeline company’s property.

Check back for an update on this developing story.