The head of Syria's opposition National Coalition on Sunday urged Arab countries to back U.S.-led Western strikes on the Damascus regime over an alleged chemical weapons attack.

"I am here before you today to appeal to your brotherly and humanitarian sentiments and ask you to back the international operation against the destructive war machine" of the Syrian regime, Ahmed al-Jarba told a Cairo meeting of Arab League foreign ministers.

U.S. President Barack Obama said Friday he had taken no "final decision" on striking Syria but that the world could not accept the gassing of women and children, as U.S. Secretary of State John Kerry said Washington knows “where the rockets were launched from."

Calling Syria's alleged use of chemical weapons a threat to U.S. national security, Obama said the response would be "narrow" and "limited."

Britain advised its citizens on Friday against all but essential travel to Lebanon, citing a recent uptick in violence and wider tensions in the region.

The Foreign Office said in the advice that British nationals already in the country should consider leaving if it is not essential for them to be here.

The International Committee of the Red Cross (ICRC) announced on Thursday that it is “appalled” by the recent developments in Syria, including last week’s reported use of chemical weapons and the ensuing escalation of events.

"The suffering of civilians in Syria has now reached unprecedented levels, and there appears to be no end in sight," said Magne Barth, the head of the ICRC’s delegation in the country, said in a released statement.

Free Patriotic Movement leader MP Michel Aoun on Tuesday called for a change in the methods of “combating terrorism” in the country, slamming what he called the “chaos” that characterizes the relations among the various security agencies.

“Everyone knows that we had warned against the entry of Syrians and said that they must be registered because we can't host people whose political affiliations we don't know, even if they come from a neighboring country,” Aoun said after the weekly meeting of the Change and Reform bloc in Rabiyeh.

Secretary General of the Gulf Cooperation Council (GCC) Abdullatif Al-Zayani condemned on Saturday the “terrorist” blasts that rocked the the northern city of Tripoli.

“Targeting worship places and innocent people is a vile criminal action,” al-Zayani said in a statement issued late on Friday.

Iranian President Hassan Rowhani on Saturday pointed to the use of chemical weapons in Syria, three days they allegedly killed hundreds of people in attacks near Damascus.

Syria's main opposition group, the National Coalition, accused the government of "massacring" more than 1,300 people in chemical weapons attacks on Wednesday.

The U.S. Embassy in Beirut on Friday reminded U.S. citizens to “avoid all travel to Lebanon due to safety and security concerns,” urging those in the country to “exercise security awareness," after at least 40 people were killed and more than 500 wounded in twin bombings that rocked mosques in Tripoli.

"Although there is no indication that U.S. citizens or interests were targets of those behind these attacks, there is a possibility of public demonstrations in response," the embassy said on its website in a security alert titled “Increase in Sectarian Violence in Lebanon.”

Unknown militants fired four rockets from the southern region of Tyre towards northern Israel on Thursday.

“Four rockets were fired from an area between Hawsh and the al-Rashidiyeh (Palestinian refugee) camp towards the Occupied Territories (northern Israel),” Lebanon's National News Agency reported.

Masked gunmen shot dead a Hizbullah supporter and two other men, including a member of the security forces, in the northern city of Tripoli early Thursday, a security official said.

"Masked men on motorbikes shot dead Hussam al-Mouri, a security official and a third man who happened to be at the scene," the official said.