Libya protesters storm parliament building in Tobruk
By Robert Plummer
Libyan protest movement says it will step up its campaign
By Angus Mcdowall & Ahmed Elumami
UN secretary general urges calm in Libya as protests spread
By Patrick Wintour
Protesters storm Libya's eastern parliament building in Tobruk, local media reports
By Mohammed Tawfeeq & Ivana Kottasová