Ferguson city leaders pledge cooperation with Justice Department police investigation

City officials in Ferguson, Missouri, are pledging their full cooperation with a federal civil-rights investigation into their police department following the death of 18-year-old Michael Brown.

Attorney General Eric Holder was expected to announce the investigation into the department Thursday afternoon at a news conference in Washington.

The north St. Louis County city issued a two-paragraph written statement vowing "our willingness to be transparent and forthright as we continue the process of earning back the trust of our residents and our neighbors in the St. Louis region."

Brown, who was black and unarmed, was shot and killed on Aug. 9 by a white officer, Darren Wilson.

The statement notes that city officials have already met several times with Justice Department community mediators since the shooting.