British Tornado jets fired precision-guided missiles at a large bunker in Libyan leader Col Muammar Gaddafi's hometown of Sirte, officials have said. The Libyan rebels are building up their forces east of Sirte, in preparation for a major assault. They continue to face unexpectedly stiff resistance. Rebel leaders are meanwhile calling on other states to unfreeze Libyan assets. Marco Werman gets an update from CBC reporter Derek Stoffel is in Tripoli.