Turkey warns Syria over border

Turkey warned on Tuesday that any Syrian military unit approaching its border will be treated as a direct threat, a serious escalation in tensions days after Syria shot a Turkish military plane out of the sky.

Turkey's NATO allies expressed solidarity with Ankara and condemned the Syrian attack but made no mention of any retaliatory action against Syria.

"The rules of engagement of the Turkish Armed Forces have changed," Prime Minister Recep Tayyip Erdogan said in a televised speech. "Any military element that approaches the Turkish border from Syria and poses a security risk and danger will be regarded as a threat and treated as a military target."