South Korean police have opened an investigation against Yoon Suk Yeol, the country’s president, for allegedly committing treason after he declared martial law on Tuesday.

The investigation comes after the opposition Rebuilding Korea party and 59 activists filed two complaints against Yoon and other cabinet members involved in Tuesday night’s chaotic events.

Insurrection is a crime that goes beyond presidential immunity and the defendant could face life imprisonment or the death penalty if found guilty.