BBC News with David Austin

The American ambassador to Pakistan, Cameron Munter, says there's evidence linking one of the main militant groups in Afghanistan, the Haqqani network, to the Pakistani government and that those links have to stop. He said the US believed the Haqqani group was behind a 20-hour gun battle in central Kabul last week. Here's Shahzeb Jillani.

Washington has been pressing Pakistan to target the Haqqani network in its North Waziristan region for

some time

now. The US

blames the group for

some of the major attacks targeting Nato-led forces in Afghanistan, and the Pakistani military says it is already

overstretch

ed and would have to think hard before opening up another war front. But increasingly it seems Washington is losing patience, complicating an already difficult relationship with Islamabad. Last Wednesday, the US warned it would have to take

unilateral

action inside Pakistan if the authorities there failed to act against the group.

Opposition forces in Libya have mounted a new assault on Sirte, Colonel Gaddafi's home city. Columns of smoke were seen as fighters tried to force their way through

densely

populated areas in the face of fierce resistance. Alastair Leithead reports.

The front lines around Sirte are moving forward. Tanks had to be jump-started today to

keep up with

the pace of the assault on Colonel Gaddafi's birthplace. After a week dug into their positions on the eastern coast road, a heavy barrage of rockets, artillery shells and Nato bombs has again pushed pro-Gaddafi troops back. To the south, the civilians who became soldiers are still firing from their pick-up trucks, and in the west too, loosely surrounding the city and moving forward every day.