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on the "newshour" tonight: we get on-the-ground accounts of the fierce fighting in tripoli from neil connery and lindsey hilsum of "independent television news." >> brown: and we interview libya's ambassador to the u.s., ali suleiman aujali. >> suarez: then, we update the case against former i.m.f. head dominique strauss- kahn, as prosecutors filed to dismiss sexual assault charges. >> brown: from pakistan, fred de sam lazro reports on an appeal for calm in a city divided by ethnic violence. >> today karachi's neighborhoods, politics and much of its strife happen along ethnic lines. >> suarez: and judy woodruff examines one organization's push to host an online national political convention and put another candidate on the presidential ballot. >> this isn't a third party. this is a second nominating process. the vision here is that in november 2012 when american voters go to the poll there will be a third ticket that they've directly nominated themselves. >> brown: that's all ahead on tonight's "newshour." major funding for the pbs newshour has been provided by: >> oil companies have changed

we begin with a report narrated by neil connery of independent television news. >> reporter: for thosethe battle for tripoli, these have been dangerous and terrifying hours. these pictures from the internet reportedly capture the latest clashes in the heart of the libyan capital. but in this fast-moving and confusing situation, what exactly do we know about the balance of power this evening? there's been heavy fighting with rebels claiming to have seized large parts of the city. the main battle was concentrated around qaddafi's fortified compound. this was his main residence and was heavily guarded, with a sophisticated communications center, bunkers and tunnels. but it now lies in rebel hands. qaddafi loyalists say they control much of the airport road. to the south of that in abu salim, they also claim to have half the area. to the north, rebels have seized green square, but there is still fighting in the nearby port. they've also moved along the coast. qaddafi loyalists surround the rixos hotel with reports of heavy fighting. tonight, the battle for tripoli looks like this. the red

we have a report narrated by neil connery of "independent television news." >> for fourth day running, the streets echo to the sound of gunfire as the syrian regime tightens its grip. army tanks head deep into the center of this city of 800,000 people in their latest advance in this crack down on protests. these streets, which have been the focus of anti-government rally, now seemingly under the control of the regime. [gunfire] the dangers to those trapped here come from many fronts. these pictures, placed on the internet, reportedly show snipers at work on the rooftops. communication with the city is cut off along with water and electricity. in what could be a sign of cracks emerging within the military, a group of soldiers calling itself the serial free army union has posted a message saying it wants to encourage others to break away. they say they want to help the generals and soldiers who are ready the leave the regime's orders. >> holman: in new york, the u.n. security council adopted a presidential statement condemning syrian authorities for attacking civilians and committing hu