BISMARCK, N.D. (AP) - Arrests have been made in North Dakota and Iowa during protests against the construction of the Dakota Access oil pipeline.

Authorities cut free a man who bound himself to construction equipment and arrested at least two protesters Wednesday during a rally near Highway 6 outside St. Anthony, North Dakota.

The site is about 20 miles west of the main protest near the Standing Rock Sioux reservation, where pipeline construction has been halted for days.

Several anti-pipeline protesters also were arrested during a rally Wednesday in Boone, Iowa. The local sheriff's office says they could face misdemeanor trespassing charges after blocking access to a Dakota Access construction staging site.

In North Dakota, Highway Patrol Lt. Tom Iverson troopers briefly closed the highway due to the protest, and construction was temporarily halted.