SULLIVAN, Ind. - Thieves swiped about 100 campaign signs for Republican presidential candidate Mitt Romney from yards in a southwestern Indiana county, police said.

Sullivan County sheriff's Lt. Jerry Mize said the signs were taken from spots around the county between late Friday and early Saturday.

Mize told the Sullivan Daily Times that political signs have been stolen around the county before, but not on this scale.

One of the signs was taken from the home of county Republican chairman Bill Springer. He said the thefts had to be well planned and involve more than one person to happen in one night.

Springer says it took him about 25 hours to put the signs up and that he's offering a $500 reward for information leading to an arrest and conviction.