BANGKOK (AP) — Thai police said Saturday that they have arrested a key anti-government protest leader and charged him with offenses including insurrection, risking further political confrontations even though a court freed him on bail hours later.

Immigration police arrested Sakhontee Phattiyagul Friday night at Bangkok’s international airport upon his return from a trip to the U.S., said Department of Special Investigation Director-General Tharit Pengdit.