G.I.'s and Syrians in Tense Clashes on Iraqi Border

A series of clashes in the last year between American and Syrian troops, including a prolonged firefight this summer that killed several Syrians, has raised the prospect that cross-border military operations may become a dangerous new front in the Iraq war, according to current and former military and government officials.
The firefight, between Army Rangers and Syrian troops along the border with Iraq, was the most serious of the conflicts with President Bashar al-Assad's forces, according to American and Syrian officials.
...But other officials, who say they got their information in the field or by talking to Special Operations commanders, say that as American efforts to cut off the flow of fighters have intensified, the operations have spilled over the border - sometimes by accident, sometimes by design.
Some current and former officials add that the United States military is considering plans to conduct special operations inside Syria, using small covert teams for cross-border intelligence gathering.