A senior US senator has called for the country to act with other nations in the wake of an alleged chemical attack atrocity in Syria to avoid getting into a "general military operation".
As the Russian foreign ministry urged the US against repeating the "mistakes of the past", Democrat Jack Reed said any American response must be international and not unilateral.
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The pair, believed to be the boy's mother and stepfather, were held after the five-year-old's lifeless body was discovered in a lagoon.