SACRAMENTO  (AP) — The California Supreme Court denied 10 clemency requests by former Gov. Jerry Brown, the first time it has exercised that power in more than half a century.

Brown granted a historic 1,332 pardons and 283 commutations during his final two terms as part of a push to scale back the state’s tough-on-crime approach that began under his first governorship. But the court blocked 10 of those requests in the final weeks of the Brown administration, which ended this month, the Sacramento Bee reported Thursday.

The court has not rejected pardon or commutation requests under a governor’s consideration since 1930 but earlier noted it had the authority in the case of an “abuse of power.”

A court representative said the justices are not planning to provide any further clarification.

The court’s rejections have baffled judicial observers.

David Ettinger, an appellate lawyer who writes a blog about the California Supreme Court called At the Lectern, said that from the information publicly available about the rejected cases, he couldn’t distinguish them from a significant number of other life-without-parole commutations that the Supreme Court signed off on.

“There’s really no guidance for future courts, for future clemency requests, for future governors making requests, as to why certain ones might get blocked and certain ones won’t,” he said.