UPDATED: Sound of shelling in Tripoli

UPDATE from Myrddin @4:04 AM Monday: Reports of fighting coming in across Tripoli now. Gaddafi tanks reported on streets. Appears to be coordinated.

UPDATE from Myrddin @7:06: Al Jazeera reports rebels claiming that all Tripoli is under their control apart from Bab Aziziyah, Gaddafi's stronghold. Two Gaddafi sons, Saif and Mohammed reported to be in custody. SkyTV live feed showing Green Square completely filled with opposition forces.

UPDATE from Myrddin @6:41: SkyTV has live news from the rebel forces. CNN and most of the other international journalists are holed up in the Rixos hotel and are reporting via Twitter that they are unable to get out due to their area being under government control. At this point the frontlines are indistinct. There is the main force making its way into the capital methodically from the East, South and West and there are groups within the capital.

State TV is still broadcasting, though it has reportedly been knocked out for brief periods during the evening.

UPDATE from Joe @ 6:18 PM: Al Jazeera English is livestreaming its Libya coverage. Things are happening fast. This will probably Qaddafi's last night as ruler of Libya. His son, and chosen successor Seif, has been captured. (or you could watch "Caught on Camera" on MSNBC.) And, as soon as I posted this, learned taht, Qaddafi's other two sons, Saadi and Muhammed, have been captured.
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Twitter user @2011feb17 claims to be posting from Tripoli itself. He just updated his feed with this audio clip taken from the capital.

Gaddafi shelling civilians in Tripoli Aug 21 2011 by ismailsalemfeb17