International envoypaid a visit to Syrian refugee camps in Turkey on Tuesday where shootings by Syrian forces from across the border wounded six people, including two Turkish officials - on Monday.
Turkish Prime Minister Recep Tayyip Erdogan on Tuesday argued the incident "was a clear violation on the border."
"We obviously take the necessary measures," Erdogan added, without specifying what the measures are. The Turkish Foreign Minister Ahmet Davutoglu has cut short a visit to China and had immediately returned to Turkey because of this rise in tension between the two countries.
In Washington, State Department spokeswoman Victoria Nuland said: “These incidents are just another indication that the Assad regime does not seem at all willing to meet the commitments that it made to Kofi Annan, Alarabiya news reported.
On his part, Annan's spokesman Ahmad Fawzi told AFP news that Kofi Annan will send a letter to the Security Council Tuesday on Syria, where a deadline for military to withdraw from urban areas has expired.
According to the Annan plan, the army must withdraw from cities by Tuesday to allow a complete cease-fire 48 hours later. The regime of Bashar al-Assad had accepted the plan, but later demanded written guarantees by the Free Syrian Army.
Assad’s forces also shot into Lebanon. A cameraman for an Arabic television station was killed in northern Lebanon while he was driving near a villager near the border.
In Moscow, Russian Foreign Minister Sergei Levrov told reporters after a meeting with his Syrian counterpart, Walid al-Moualem that Syria had begun to implement the Annan plan.
"We discussed with Minister Mouallem details of the plan (Annan). We were informed about the beginning of the implementation of this plan by the Syrian leadership," Lavrov said.
"We have already completed the withdrawal of our military units in some provinces," said Mr. Moallem. "The cease-fire must begin with the arrival of international observers," he added. Muallem's visit to Moscow coincides with the deadline set by the UN for a withdrawal of the Syrian army and the start of a full cease-fire on Thursday.
However, activists reported reported that 1,000 people have been killed by government forces in the last eight days despite promises from Damascus to implement the plan of the international envoy Kofi Annan.