The latest footage to arrive from the Turkish side of the border appears to show troops massing in villages on the Syrian side.
There have been protests in the northern part of Syria bordering Turkey following military assaults on towns and villages around Jisr al-Shughour and Aleppo.
Our reporter in Turkey describes the feeling at the border as one of anxious anticipation. Refugees are reporting that the army is flattening their houses, but this has not been possible to confirm.
The continuing military crackdown continues to push refugees to seek refuge in Turkey.
On foot or by van – they come any way they can.
One family said they fled in fear as Syrian troops stormed their village on Thursday. They say they saw a 90-year-old man being killed.