PHNOM PENH, Cambodia — Two 10th century Cambodian stone statues displayed for nearly two decades at New York's Metropolitan Museum of Art were returned to their homeland Tuesday in a high-profile case of allegedly looted artifacts.

The voluntary return of the pair of "Kneeling Attendants" statues by one of America's foremost cultural institutions is seen as setting a precedent for the restoration of artworks to their places of origin, from which they were often removed in hazy circumstances.

It comes as the Cambodian government is asking other museums to return similar objects. At the government's request, U.S. authorities have begun legal action against Sotheby's auction house to try to force the handover of a contested piece....