SKY news said:
Turkey says it has struck targets inside Syria with artillery fire in retaliation for a mortar strike which killed a woman and her children in a Turkish town.
A statement from the Turkish Prime Minister's office said it was in response to a "mortar strike across the border".
Nato ambassadors are to meet later tonight after Turkey protested angrily to the organisation and to the United Nations
The mortar exploded in a residential area of the border town of Akcakale. It was fired from from Tall al Abyad just across the border in Syria.
Abdulhakim Ayhan, the mayor of Akcakale, said: "Five people, including a mother and her three children, were killed. We also have nine wounded."