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the city, which is often cast into darkness. Congo's hydroelectric dams are poorly maintained, and water levels are low.

BBC News

BBC News with Gaenor Howells

Hundreds of Libyan rebels have arrived in the capital Tripoli after fighting their way from the west. They were greeted by people lining the streets and waving rebel flags. Earlier, the rebels took control of a key military base on the western approach to Tripoli. Other rebels have set up checkpoints in suburbs on the eastern outskirts of the capital. There's been gunfire near the central hotel where foreign journalists are staying. Matthew Price sent this report.

数百名利比亚叛军从西部一直向前推进，现在已经抵达首都的黎波里，人们列道两旁，挥舞着叛军旗帜对他们表示欢迎。此前，叛军控制了西部通往的黎波里途中的一个关键的军事基地。其他叛军在首都东部郊区设置了检查点。外国记者入住的中央酒店附近出现了枪声。Matthew Price发回报道。

The rebels have called this "zero hour" - the hour when the uprising came back to Tripoli. Throughout the night and much of the day, there's been the sound of gunfire, small arms and heavy weapons and explosions, both sides fighting in what may be the final battle of this six-month-long conflict. It's clear there have been bloody battles in parts of the city. In areas where the fighting has not been taking place, people were said to be staying indoors. A government source here told the BBC that there are 65,000 professional soldiers loyal to Colonel Gaddafi ready to defend this city. The source also believes that the tribes here are preparing to protect their own.