U.S. Park Police officials are searching for at least one suspect as cleaning crews remove graffiti from six locations on the National Mall, including at the Lincoln Memorial, World War II Memorial, Washington Monument, and the D.C. War Memorial.

The markings include similar phrases such as “Jackie shot JFK” and “blood test is a lie… leukemia, cancer and HIV.” Sargent Anna Rose, a spokeswoman for the park police, told reporters at a press conference this morning that the graffiti also referenced the September 11th terrorist attacks on the World Trade Center.

Officials suspect that the damage happened Saturday night, and they found the vandalism early Sunday morning.

National Park Service spokesperson Mike Litterst said that because the messages were similar in context and handwriting, he believes that the same person is responsible for all six tags, which were written using a permanent marker.

Police will charge the suspect with vandalism, and the graffiti is not being classified as a hate crime, said Rose, as she stood outside of the the Lincoln Memorial, which was tagged twice.

The suspect also tagged the Washington Monument, World War II Memorial, D.C. War Memorial, and a utility box at the intersection of 15th Street and Jefferson Drive SW.

Many of the surfaces have already received first treatments, and Litterst said that the “ugly scars” will be completely removed in about two weeks after several rounds of cleaning.

Officials will use surveillance video, among other things, to gather leads and identify a suspect, Rose said.

This post has been updated.