Syrian shells kill Turkish nationals: Hillary Clinton 'outraged at Syrians'
Turkish artillery has fired on targets in Syria after shells from across the border killed five Turkish nationals.
There are unconfirmed reports that a number of Syrian troops were killed in the Turkish retaliatory fire.
Turkey's border town of Akcakale was shelled, apparently by Syrian government forces, on Wednesday, killing a woman and three children.
US Secretary of State Hillary Clinton said: "We are outraged that the Syrians have been shooting across their border... and regretful of the loss of life on the Turkish side."