South Korean police question security chief of impeached president Yoon Suk Yeol

South Korea's presidential security chief resigned Friday as he faced questioning over why his guards prevented the detention of impeached President Yoon Suk Yeol, and as investigators prepared to make a fresh arrest attempt.

Yoon last week resisted arrest in a standoff between his guards and investigators after his short-lived power grab on December 3 plunged South Korea into its worst political crisis in decades.

Yoon's Presidential Security Service (PSS) chief Park Chong-jun -- a former police officer -- submitted his resignation on Friday morning "as he attended a police questioning", a PSS official told AFP.