South Korean President Yoon Suk Yeol has been arrested for questioning, according to the country’s anti corruption agency, in the latest chapter of a weekslong political saga that began with the embattled president’s shock martial law decree last month.

The presidential security service prevented investigators from detaining Yoon on Jan. 3 and are now preparing for more forceful measures.

Hundreds of law enforcement officials in South Korea have entered the residential compound of impeached President Yoon Suk Yeol in Seoul.