"The threats of direct aggression against Syria will only increase our commitment to our deep-rooted principles and the independent will of our people. Syria will defend itself in the face of any aggression," state television quoted Assad as telling a delegation of Yemeni politicians. Assad added that Syria is determined to wipe out terrorist cells that are supported by the West and Israel. Earlier, UN Secretary-General Ban Ki-moon said U.N. experts seeking to collect evidence from an apparent chemical attack in Syria that killed hundreds of people will report to him as soon as they leave the country Saturday. The team is expected to complete its inspection on Friday and their conclusions will be shared with members of the Security Council, Ban said. He didn't specify when that might be. Ban has urged restraint in the face of increasing signs of retaliatory military action against Syrian President Bashar Assad by the United States and its allies. Speaking to reporters, Ban said he repeated that message Wednesday in a conversation with President Barack Obama. The findings of the experts will also be shared with all U.N. member countries, said Ban. US leaders, including Vice President Joe Biden, have charged that Assad's government was behind the Aug. 21 attack that Doctors Without Borders says killed at least 355 people. The White House says it's planning a possible military response while seeking support from international partners. The United Nations team of chemical weapons experts in Syria reached rebel-held territory outside Damascus on Thursday, activists said, and was preparing to start a third day of investigations into an apparent poison gas attack in the area. The Syrian regime has denied using chemical weapons on its own civilians last week. Obama said he was not seeking a lengthy, open-ended conflict in Syria, indicating that any US response would be limited in scope. But he argued that Syria's alleged use of chemical weapons not only violated international norms, but threatened America. Laying out a legal justification for a U.S. response, Obama said Syria was violating the Geneva Protocols, an agreement signed in 1925 in the wake of World War I to ban the use of chemical gases. The White House has also cited the Chemical Weapons Convention, a 1992 agreement that builds on the Geneva Protocols by prohibiting the development and stockpiling of chemical weapons. Syria is a party to the original Geneva accord, but not the latter chemical weapons agreement. Syria, which sits on one of the world's largest stockpiles of chemical weapons, has denied the charges.