BBC News with Jonathan Izard

Clashes have continued throughout the day in Syria's second city Aleppo with more government and rebel forces on the way there. The rebels said thousands of government soldiers with tanks were heading to Aleppo from Idlib to try to

oust

opposition fighters. As the violence continues, Turkey has closed its border with Syria, but refugees will still be allowed to cross. Wyre Davies reports from Killis.

Here at one of Turkey's main border crossing to Syria, there's a growing sense of anxiety and

foreboding

at the increasing violence inside Syria. Turkey, once a close ally of Bashar al-Assad, has made it clear it can no longer support the leader who is prepared to kill his own people in such large numbers. Today, Turkey also formally closed all of its borders with Syria. Refugees will still be allowed into the numerous camps in Turkey. Today, one woman told me how she and her young daughter had escaped the aerial bombardment in Aleppo. There was so much bombing that people had to leave the dead where they fell, she said.

The US Treasury Secretary Timothy Geithner has told members of Congress that he passed on his concerns about the possible

manipulation

of the key inter-bank lending rate to the British authorities more than four years ago. The revelation comes after Barclays Bank was fined more than $450m for attempting to fix the rate

in its favor

.

"We did the important and fully