US: Proven link of Assad to gas attack lacking

San Francisco Chronicle: WASHINGTON (AP) — The White House asserted Sunday that a "common-sense test" dictates the Syrian government is responsible for a chemical weapons attack that President Barack Obama says demands a U.S. military response. But Obama's top aide says the administration lacks "irrefutable, beyond-a-reasonable-doubt evidence" that skeptical Americans, including lawmakers who will start voting on military action this week, are seeking.

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