The raging wildfire burning through a remote section of Yosemite National Park has gained strength, threatening nearby communities as well as water and electrical resources for San Francisco.
A senior US administration official says there is "very little doubt" that a chemical weapon was used by the Syrian regime against civilians in an incident that killed at least a hundred people last week. The White House says if chemical weapons were used, the act will not go unpunished.
Abu Mohammed Al-Golani, the leader of an al-Qaida-linked Syrian rebel group, has vowed to target Shiite Muslim villages to avenge a deadly alleged chemical weapons attack in Damascus. President Bashar Assad's regime is dominated by the Alawite minority, an offshoot of Shiite Islam.