The elite Sofia University campus woke up fully occupied on Monday morning, its doors locked with padlocks and chains, in anti-governmental protest.

The radical step has been taken during the night by students, who have occupied part of the university campus three weeks ago in protest against the Socialist-led government of Plamen Oresharski.

The academic process has been brought to a complete halt as protesters do not let either teachers or administrative staff.

Students at 15 universities across the country are now occupying buildings and preventing teaching in protest at the centre-left coalition.

The first of the protests began when students at the elite Sofia University occupied Lecture Hall 272, the largest teaching room in the St. Kliment Ohridski building on 23 October.

They have been blockading the building since then, bringing classes to a halt, in what they are calling an “indefinite” occupation.

At least 3 people were detained Sunday as thousands marched in the streets of Bulgarian capital Sofia to request the resignation of Bulgarian PM Plamen Oresharski.

Protesters chose the symbolic date November 10 to show their exasperation at the lack of morality in Bulgarian politics, 24 years after the fall of the communist regime in Bulgaria.

Sunday was the 150th day since protesters against the Oresharski cabinet first walked out, June 14, after the appointment of controversial media mogul Delyan Peevski for head of Bulgaria's State Agency for National Security.

Peevski's reinstatement as MP after his resignation from the Security Agency provoked a student occupation at Sofia University, which culminated in Sunday's "March of Justice."

Protesters have claimed that the Oresharski cabinet, backed by the Bulgarian Socialist Party and the liberal Movement for Rights and Freedoms exemplifies in an acute form the deep influence of the so-called Bulgarian oligarchy on politics.