INDIANA, Pa. -- State police say a swastika was spray painted on a campaign sign for Sen. Barack Obama in an Indiana County couple's yard.

Kamal Youssef and his wife, Maria, say they found the defaced sign on Saturday.

Police and an Obama campaign official say it appears to be an isolated incident.

Youssef is 86 years old and moved to the United States from Egypt. He became a citizen in 1958. His wife is an immigrant from Czechoslovakia and is also a U.S. citizen.

Youssef is a Muslim, while his wife identifies with the Christian Orthodox faith.

The couple told the Pittsburgh Post-Gazette they don't believe they were personally targeted. They say neighbors in the Amish farming community of Dayton have known them for decades.