Prince George's County police are investigating a complaint that the campaign signs of a black candidate for the Maryland House of Delegates have been routinely torn down or painted with the letters KKK.

Democrat C. Anthony Muse, one of two blacks running in the county's 27th legislative district, met with police officials yesterday and filed a vandalism report. Some of his supporters plan to file complaints with the county Human Rights Commission, Muse said.

Muse, minister of the 700-member Giddings United Methodist Church in Brandywine, said about 600 signs posted throughout the district, which covers the southern half of the county, have been destroyed in three weeks.

Many of the signs were on public land while others were vandalized or stolen from the front yards of campaign supporters. This week, campaign workers spotted signs painted with the initials KKK and a racial slur, Muse said.

Police spokesman H.S. Blake said police officers have been assigned to patrol the area in Accokeek where they confiscated one sign with a racial slur.

Muse, 32, is running against Dels. Gary Alexander, Joseph Vallario and James Proctor in the Sept. 11 Democratic primary for the district's three seats in the House. Proctor, a former schoolteacher and principal, became the first black legislator from the district when he was appointed this spring to fill out the term of former delegate William McCaffrey.

In the last few evenings, Muse's family and campaign workers have been putting up an additional 500 signs. "As fast as they go up, they come down," said the candidate's wife, television news anchorwoman Pat Lawson Muse.

Doris Lane, a resident of Charles County, said she alerted the NAACP and Muse about a sign at Accokeek and McKendree roads that she saw for the first time Sunday. "I saw KKK written in bold black letters all over his face," Lane said yesterday.