GUATEMALA CITY — Otto Perez Molina spent his first night as an ex-president in military custody following a historic day in which he resigned and Guatemala’s Congress swore in Vice President Alejandro Maldonado to serve the remainder of his term.

The judge hearing a corruption and fraud investigation against Perez Molina ordered the former president held in custody until the hearing reconvened Friday morning. Perez Molina left the court under heavy police guard and was later seen entering a military barracks in the capital.