Missing adult female horseback rider searched for in McMaster Hills, Montana; multi-county, aerial support involved.

A search is ongoing for a missing adult female horseback rider in the McMaster Hills Recreation Area, northeast of Helena, Montana. Teams from Lewis and Clark and Jefferson counties are conducting ground searches, supported by drones and a helicopter from Great Falls. Authorities will remain active in the area throughout the day. Anyone with information or wishing to help is encouraged to call 406-219-7380. Further updates will follow as available.