Two US senators said Syria's air defence system isn't as strong as was once thought and add that recent air strikes show the regime is vulnerable.
Former Republican presidential candidate Senator John McCain and Democratic Senator Patrick Leahy said today that Syrian President Bashar al-Assad's air defence systems were not impenetrable.
In recent days reported air strikes launched by Israel targeted a shipment of advanced missiles believed to be headed for the Lebanese militant group Hezbollah.
Speaking on Fox News Sunday, McCain said Syria had crossed another "red line" in transferring weapons to US aggressors, but he does not believe US ground forces should go into Syria to secure the weapons.
Leahy spoke to NBC's "Meet the Press".
More top news
Medical staff who helped during the Westminster terror attack have received a royal thanks for their life-saving efforts.
Colin Gregg, the son of the founder of the Greggs bakers chain, has been jailed at Newcastle Crown Court for 13 and a half years.
Khalid Masood was killed by a single gunshot to his chest, after the terror attack which claimed the lives of four people, an inquest heard.