A former Bolivian minister who took refuge inside the Mexican ambassador's residence in La Paz has returned to his home and been placed under investigation for corruption.

Youth activists protested outside the home of Carlos Romero - a former interior minister under ex-president Evo Morales - for a second consecutive day, chanting slogans and waving Bolivian flags. Morales said on Twitter that Romero was "surrounded by paramilitary groups promoted by the de facto government of Bolivia. With police support."

Romero has been summoned to face anti-corruption prosecutors at a hearing on Monday, according to a subpoena affixed to his door.

He was one of around 10 Bolivian officials who took refuge in the Mexican ambassador's residence after Morales resigned on November 10 and fled to Mexico following a wave of post-election violence.