INDIANAPOLIS -- Twenty-four people were arrested Saturday after police discovered spray-painted graffiti on the Statehouse -- messages that authorities said were part of a protest against an extension of Interstate 69.

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Slideshow: See Vandalism
Video: Police: Cleanup To Cost $1,000

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Authorities said the 24, walking away from the Statehouse and chanting about I-69, disregarded an officer who tried to ask them questions about the graffiti shortly before 1 p.m.

Other officers arrived, and the 24 were arrested on disorderly conduct charges a few blocks northwest of the building, state police 1st Sgt. Dave Bursten said.

The graffiti was found on two exterior walls, two pillars on the interior and in other places. Among the spray-painted messages were "I69 is the enemy" and "No I-69."

Police said they tentatively identified one of the 24 -- Alison R. Phillips, 20, of Bloomington -- as being someone who allegedly spray-painted the Statehouse's exterior.

An Indianapolis police officer subdued one of the arrestees with a stun gun because she had jumped on a Capitol police officer's back, authorities said. That person, for whom police didn't have a name, faces charges of battery on a police officer, resisting arrest and disorderly conduct. Earlier, TheIndyChannel.com incorrectly identified one of the arrestees as being this person.

Police said at least 10 of the 24 were not from Indiana. Police didn't know where two of the 24 live, and they didn't have a name for one.

"We're still very early in the investigation, but it's becoming clear this was a group of protestors-for-hire that likely don't have a specific interest in I-69," Bursten said. "We base that on spontaneous statements made by some of the arrested and the fact that of the known ... people arrested today, only 12 are from Indiana."

I-69 currently runs from Michigan, near the Canadian border, to Indianapolis. Federal officials intend to extend the highway to Texas' border with Mexico.

Before being taken away by police, one of the protesters, Colin Schoder-Ehri, 25, of Bloomington, said the group was against extending I-69 because it will "extend" the North American Free Trade Agreement and "because it's going to destroy jobs."

Authorities said they confiscated video cameras from some of the arrestees, hoping that someone recorded footage of the spray-painting as it happened.

Police said it will cost about $1,000 to clean the graffiti.

The following are the arrestees for whom police had names:

Nathan L. Wax, 19, Columbia, Mo.

David P. Miseveth, 24, of Sterling, Mich.

Eryn C. Trimmer, 19, of Indianapolis

Hugh F. Farrell, 19, of Indianapolis

Massimo Angioni, 28, of Lafayette

Karlene P. Knable, 20, of Indianapolis

Josh A. Medlin, 21, of Lynn

Joseph R. Stein, 19, of St. Louis

Emily G. Huthings, 21, of Chestwood, Ky.

Sara E. Ublemart, 22, of Louisville, Ky.

Kate B. Weiss, 19, of Pittsburgh, Pa.

Colin J. Schoder-Ehri, 25, of Bloomington

Alison R. Phillips, 20, of Bloomington

Robert P. Ivers, 18, of Indianapolis

Luke Welke, 30, of Indianapolis

Brian A. Geier, 25, of Centerville

Frank B. Ambrose, 30, of Detroit

Joe A. Dunn, 20, of Atlanta

Sean S. Brock, 19, who said he was homeless

Hathan J. Jun, 26, of Lafayette

Ashley M. Bontragor, 19, of Goshen

Andrea M. Radmacher, 25, Louisville, Ky.

Miatta S. Kawinzi, 18, of Louisville, Ky.