Greek Prime Minister George Papandreou addressed an audience at the noted Humboldt University here on Monday evening, although his speech was interrupted at several points by a group of students shouting slogans and unfurling a banner in the auditorium.

On his part, Papandreou called on the protesters to first listen to his speech and then protest if they want. According to reports, the Greek PM asked if the protesters had a representative who could take the podium and express their views.

"In Greece we need to proceed with major changes; it would be good if protest, by itself, could solve Greece's problems."