Latest set of updates:
11.22pm: News is trickling in about the targets of tonight's attacks. Mohammed Ali, a spokesman for the exiled opposition group the Libyan Salvation Front, said the Libyan air force headquarters at the Mateiga air base in eastern Tripoli and the Aviation Academy in Misrata had both been targeted.
11.15pm: Reuters interviews people in Benghazi and they respond with enthusiasm to today's air and missile strikes against the Gaddafi regime:
Iyad Ali, 37, unemployed: "We think this will end Gaddafi's rule. Libyans will never forget France's stand with them. If it weren't for them, then Benghazi would have been overrun tonight."
Khalid al-Ghurfaly, 38, civil servant: "We salute, France, Britain, the United States and the Arab countries for standing with Libya. But we think Gaddafi will take out his anger on civilians. So the West has to hit him hard."
Faraj Omar, 55, engineer: "We've all seen the news but we'll see what the results are later. To have any effect Gaddafi must be hit in Aziziyah, this is the head of the snake," he said referring to Gaddafi's heavily-fortified Tripoli compound.
11.05pm: Libyan state television is claiming that a French jet was shot down over Libya today. The French immediately denied it, and there's no evidence to support the Libyan claim.
11pm: Libya's air defences have been "severely disabled" in today's attacks, Reuters quotes an unidentified US official as saying:
Muammar Gaddafi's air defenses have been "severely disabled" by a barrage of US-led missile strikes launched on Saturday, a US national security official said. "Qaddafi's air defense systems have been severely disabled. It's too soon to predict what he and his ground forces may do in response to today's strikes," the source said on condition of anonymity.
10.50pm: Qatar and the UAE will be sending forces to the no-fly zone. AFP is reporting that the United Arab Emirates will be contributing 24 fighter jets – Mirage 2000-9s and F-16s – while Qatar will contribute between four and six Mirage 2000-5s, according to a French official.
10.45pm: Al-Jazeera has announced that a British journalist was among the group of four arrested and detained by Libyan forces in Tripoli today.
Al-Jazeera said Kamel Atalua was a cameraman for the network, and was arrested with cameraman Ammar al-Hamdan, who is Norwegian, and correspondents Lotfi al-Messaoudi and Ahmed Vall Ould Addin, who are Tunisian and Mauritanian nationals. The group had been reporting from Libya for several days.
10.36pm: Listening to Gaddafi's address – conducted over the phone but broadcast on state television – it was only three minutes long but in every other respect it was vintage Gaddafi.
There as a chilling warning of the danger to civilians throughout the Mediterranean, saying: "Targets in the Mediterranean are under threat" because of the "unjustified, mad aggression".
10.30pm: There are reports that a Libyan journalist, who ran a website detailing the Gaddafi regime's attacks and providing commentary on the uprising, was killed on Saturday in Benghazi.
Mohammed al-Nabbous, who founded a livestream channel called Libya al-Hurra, or Free Libya, is said to have been hit by sniper fire as Gaddafi's forces attacked the city.