NATO will defend alliance member Turkey, which struck back after mortar rounds fired from Syria landed inside its border, the alliance’s Secretary General Anders Fogh Rasmussen said at a meeting in Prague on Monday.

“NATO as an organization will do what it takes to protect and defend Turkey, our ally. We have more plans in place to make sure that we can protect and defend Turkey and hopefully that way also deter so that attacks on Turkey will not take place,” he said.

Rasmussen also welcomed a weekend agreement by Syrian opposition groups to put aside differences and form a new coalition.

A Syrian fighter jet on Monday bombed an area near the Turkish border, causing several casualties, officials and witnesses said.

An Associated Press video journalist saw the plane bomb an area around the Syrian town of Ras al-Ayn, some 10 meters (yards) from the Turkish border.