In pictures: Libya update

A combo of file pictures created on April 20, 2011 shows Libyan leader Moamer Kadhafi. Kadhafi is facing an unprecedented challenge to his four-decade rule of the oil-rich North African country as forces loyal to his regime continue to battle rebels who have launched an uprising since mid February. Moamer Kadhafi's 42-year rule in Libya is "clearly crumbling," NATO Secretary General Anders Fogh Rasmussen said early Monday as rebels launched a fierce street battle for Tripoli in a final push for victory. AFP PHOTO

Libyan rebel fighters walk past a road sign reading Tripoli (top), Zhrah (middle) and Benghazi (bottom) as rebels advance through the town of Maia, 25 kms (15 miles) west of Tripoli August 21, 2011. REUTERS/Bob Strong

epa02874783 Thousands of people, mostly Libyans, gather outside the Libyan Embassy in Tunis, Tunisia on 21 August 2011, where the insurgents' flag was hoisted on the roof of the building. Explosions and heavy gunfire were heard late on 20 August in Tripoli, Libya, with rebels saying they were advancing into the capital as Libyan leader Moammer Gaddafi‘s regime crumbled. Rebels said that demonstrators took to the streets after sunset across the capital. Shortly after, sounds of explosions rocked the city in what rebels said was a 'planned uprising' by opposition supporters there. EPA/STR

Libyan rebel fighters and civilians ride through the town of Maia celebrating after rebels pushed to within 25 kms (15 miles) of Tripoli, August 21, 2011. REUTERS/Bob Strong

People celebrate the capture in Tripoli of Moammar Gadhafi's son and one-time heir apparent, Seif al-Islam, at the rebel-held town of Benghazi, Libya, early Monday, Aug. 22, 2011. Libyan rebels raced into Tripoli in a lightning advance Sunday that met little resistance as Moammar Gadhafi's defenders melted away and his 40-year rule appeared to rapidly crumble. The euphoric fighters celebrated with residents of the capital in the city's main square, the symbolic heart of the regime. (AP Photo/Alexandre Meneghini)

People wave flags of the Kingdom of Libya and hold a cartoon illustration of Libya's leader Muammar Gaddafi as they gather near the courthouse in Benghazi August 22, 2011 to celebrate the entry of rebel fighters into Tripoli. Jubilant rebel fighters streamed into the heart of Tripoli as Gaddafi's forces collapsed and crowds took to the streets to celebrate, tearing down posters of the Libyan leader. REUTERS/Esam Al-Fetori

People celebrate the capture in Tripoli of Moammar Gadhafi's son and one-time heir apparent, Seif al-Islam, at the rebel-held town of Benghazi, Libya, early Monday, Aug. 22, 2011. Libyan rebels raced into Tripoli in a lightning advance Sunday that met little resistance as Moammar Gadhafi's defenders melted away and his 40-year rule appeared to rapidly crumble. The euphoric fighters celebrated with residents of the capital in the city's main square, the symbolic heart of the regime. (AP Photo/Alexandre Meneghini)

Tens of thousands of Libyans celebrate what the rebels claim to be the first uprising in Tripoli against the Kadhafi's regime on August 21, 2011 at freedom square in Benghazi, Libya. Several explosions and heavy gunfire were heard late Saturday in Tripoli, as witnesses reported fighting in some neighbourhoods of the Libyan capital. Gunfire erupted in central Tripoli after the break of the dawn-to-dusk fast of Ramadan. AFP PHOTO / GIANLUIGI GUERCIA *** Local Caption *** 649075-01-08.jpg

Libyans embrace each other as tens of thousands of Libyans celebrate the arrest of Kadhafi's son Saif al-islam and the partial fall of Tripoli in the hands of the Libyan rebels on August 21, 2011 in Benghazi, Libya. Libyan rebels have reached the highly symbolic Green Square in the centre of Tripoli, Sky News said early on August 22, 2011, showing scenes of jubilant crowds gathered there. Young men, many waving the red, black and green flag of anti-regime forces, were shouting and dancing in obvious joy, shouting Allahu Akbar (God is greatest) and some firing rifles into the air. AFP PHOTO/GIANLUIGI GUERCIA

People celebrate the capture in Tripoli of Moammar Gadhafi's son and one-time heir apparent, Seif al-Islam, at the rebel-held town of Benghazi, Libya, early Monday, Aug. 22, 2011. Libyan rebels raced into Tripoli Sunday and met little resistance as Gadhafi's defenders melted away and his 42-year rule rapidly crumbled. (AP Photo/Alexandre Meneghini)

People celebrate the capture in Tripoli of Moammar Gadhafi's son and one-time heir apparent, Seif al-Islam, at the rebel-held town of Benghazi, Libya, early Monday, Aug. 22, 2011. Libyan rebels raced into Tripoli in a lightning advance Sunday that met little resistance as Moammar Gadhafi's defenders melted away and his 40-year rule appeared to rapidly crumble. The euphoric fighters celebrated with residents of the capital in the city's main square, the symbolic heart of the regime. (AP Photo/Alexandre Meneghini)

A boy holds a drawing depicting Moammar Gadhafi and his son Seif al-Islam being hanged during celebrations of the capture in Tripoli of the son at the rebel-held town of Benghazi, Libya, early Monday, Aug. 22, 2011. Libyan rebels raced into Tripoli Sunday and met little resistance as Gadhafi's defenders melted away and his 42-year rule rapidly crumbled. The words on the caricature reads "Did we already take Benghazi?" (AP Photo/Alexandre Meneghini)

Libyan rebel fighters rest in front of a shop as they advance through the town of Maia, 25 kms (15 miles) from Tripoli, August 21, 2011. REUTERS/Bob Strong

Rebel fighters look towards the enemy as they hear the sound of bombardments in the village of Mayah, some 30 kilometers west from Tripoli, LIbya, Sunday, Aug. 21, 2011. Libyan rebels said they were less than 20 miles (30 kilometers) from Moammar Gadhafi's main stronghold of Tripoli on Sunday, a day after opposition fighters launched their first attack on the capital itself. Fighters said a 600-strong rebel force that set out from Zawiya has reached the outskirts of the village of Jedaim and was coming under heavy fire from regime forces on the eastern side of the town. (AP Photo/Sergey Ponomarev)

RETRANSMISSION TO ADD BYLINE - In this Wednesday, Aug. 17, 2011 photo, a Libyan rebel fighter enters an incomplete mosque that has been used as shelter during the shelling from Moammar Gadhafi's forces in Sabratha, 50 miles (75 kilometers) west of Tripoli, Libya. (AP Photo/Giulio Petrocco)

A Libyan rebel fighter steps on a rug woven with the face of Libyan leader Muammar Gaddafi at a checkpoint near the town of Aziziyah, August 21, 2011. REUTERS/Bob Strong

Painter Rafat Askar, 46, rests at the seaside of the rebel-held town of Benghazi, Libya, Thursday, Aug. 18, 2011. The paint on the wall reads: "Libya Free." (AP Photo/Alexandre Meneghini)

A man carrying a pre-Gadhafi Libyan flag walks on the sea front in at the rebel-held town of Benghazi, Libya, Friday, Aug. 19, 2011. (AP Photo/Alexandre Meneghini)

Demonstrators wave flags of the Kingdom of Libya during a protest against Libyan leader Muammar Gaddafi outside of the Libyan embassy in Ankara August 22, 2011. Libyan rebel fighters poured into Tripoli and on Monday morning controlled most of the capital, though fighting persisted in a few districts. The whereabouts of Libyan leader Muammar Gaddafi were unknown but the rebels held two of his sons, Saif Al-Islam and Mohammed. REUTERS/Umit Bektas

Demonstrators smash a poster of Libyan leader Muammar Gaddafi during a protest against Gaddafi outside of the Libyan embassy in Ankara August 22, 2011. Libyan rebel fighters poured into Tripoli and on Monday morning controlled most of the capital, though fighting persisted in a few districts. The whereabouts of Muammar Gaddafi were unknown but the rebels held two of his sons, Saif Al-Islam and Mohammed. REUTERS/Umit Bektas

Local residents greet advancing rebel fighters on the outskirts of Tripoli, Libya, Monday, Aug. 22, 2011. Clashes broke out early Monday near Moammar Gadhafi's compound in Tripoli, a day after rebels poured into the Libyan capital in a stunning advance that met little resistance from the regime's defenders. (AP Photo/Sergey Ponomarev)

Libyan rebel fighters search vehicles at a checkpoint in Tripoli's Qarqarsh district August 22, 2011. Libyan government tanks and snipers put up scattered, last-ditch resistance in Tripoli on Monday after rebels swept into the heart of the capital, cheered on by crowds hailing the end of Muammar Gaddafi's 42 years in power. REUTERS/Bob Strong