Syrian authorities thwarted an attempt by an “armed terrorist group” to infiltrate Syria from northern Lebanon, Syrian Arab News Agency, SANA, reported Thursday.

It quoted a source in Reef Tall Kalakh as saying that one member of the group was injured while the rest escaped back to Lebanon during a clash with “concerned authorities.”

The international community has to do more to isolate the Syrian regime after the latest "brutal and sickening" massacre in the country, British Prime Minister David Cameron said Thursday.

"We need to do much more to isolate Syria, to isolate the regime, to put the pressure on and to demonstrate that the whole world wants to see a political transition from this illegitimate regime to actually see one that can take care of its people," Cameron told reporters during a quick stop in Oslo.

Phalange party leader Amin Gemayel revealed on Thursday that his party continuously voiced its support to the national dialogue.

“Our stance is very clear regarding this matter,” he said after holding talks with Maronite Patriarch Beshara al-Rahi in Bkirki.

Syria's Muslim Brotherhood accused the Damascus regime of being behind a new massacre in the strife-torn country and said the world community, including Arab nations, also bear responsibility.

The Islamist group said more than 100 people, including women and children, had been massacred on Wednesday in the town of Al-Kubeir, in the central Hama region, and dozens more were killed earlier the same day in Al-Haffa, a town in the coastal region of Latakia.

Syrian rebels went on the offensive in and around Damascus on Wednesday, a watchdog said, as activists accused regime forces of committing a “massacre” in Hama’s countryside that left at least 47 people dead.

The Local Coordination Committees, the main activist group spurring protests on the ground, said regime forces killed at least 47 people in the town of Mazraat al-Qubair in Hama’s countryside.

U.N.-Arab League envoy Kofi Annan will on Thursday propose that the western powers, Russia and China form a new international group to press President Bashar al-Assad into political talks to end the deadly crisis, diplomats said.

Annan could even call for Iran and other key Middle East nations to be let into the so-called Contact Group when he makes the proposal to the U.N. Security Council, sources said.

U.S. Secretary of State Hillary Clinton said Wednesday she would reserve judgment on a Russian proposal for a global conference on Syria that would include Iran together with other powers.

"It's hard to imagine inviting a country (Iran) that is stage managing the Assad regime's assault on its people," she said at the end of a visit to Azerbaijan, referring to Syrian President Bashar al-Assad.

Syrian President Bashar al-Assad's policies risk creating genocide in the conflict-torn country unless there is swift action to stop him, Italian Foreign Minister Giulio Terzi said on Wednesday.

France on Wednesday denounced President Bashar al-Assad's appointment of a new prime minister as a "masquerade" that does not meet the demands of the Syrian people or the international community.

"Bashar al-Assad remains stubbornly deaf to the demands of his people" and the move "does not meet the expectations of the Syrian people or the international community," foreign ministry spokesman Bernard Valero said.

The United States endorsed Wednesday the Arab League's proposal to invoke the United Nations' tough Chapter VII sanctions against the Syrian regime.

But Washington held off from supporting Chapter VII's powers to initiate a military intervention and focused on economic sanctions against Syrian President Bashar Assad's embattled government.