Western countries press on in Libya

Tripoli, Libya - Leaders of Britain, France and the United States vowed on Friday to keep up their military campaign in Libya until Muammar Gadhafi leaves power, as the Libyan leader toured the streets of Tripoli.

Meanwhile, Western powers struggled to stay united over a NATO-led air campaign that has so far failed to budge Gadhafi from power.

In a bid to put on a united front, however, British Prime Minister David Cameron, France's President Nicolas Sarkozy and US President Barack Obama penned a joint article dismissing a Libyan future with Gadhafi as "unthinkable" and an "unconscious betrayal" by the rest of the world.