LOS ALAMOS, N.M. (AP) — Rangers at Bandelier National Monument are asking for the public's help as they investigate vandalism at one of the park's historic sites.

Authorities say extensive damage was done at Duchess Castle during two separate incidents. They declined to provide more details, citing the ongoing investigation.

They announced Wednesday that a reward of up to $10,000 is being offered for information leading to the arrest and conviction of those responsible for the vandalism.

Duchess Castle is separate from the main park and includes what is left of a home and pottery-making school that date back about a century. The area also includes more than 150 archaeological sites associated with the ancestral pueblo occupancy of the Pajarito Plateau.