NANTUCKET, Mass. (AP) — Police in Massachusetts continue to search for the person who vandalized an African-American historical site with racist graffiti.

The Cape Cod Times reports Nantucket police haven't arrested any suspects nearly four months after the outside of the 19th century African Meeting House was spray-painted with racist and sexually explicit slurs. The building was constructed around 1827 and later restored.

Nantucket Police Chief Bill Pittman says people have speculated on social media but haven't contacted the department.

Detective Tom Clinger says he has interviewed 15 people concerning the case. Police also reviewed surveillance images to check alibis of suspects in the case.

Pittman says the FBI has even reviewed some of the interviews the department conducted.

Nantucket police encourage anyone with information on the incident to contact the department.

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Information from: Cape Cod (Mass.) Times, http://www.capecodtimes.com