US intelligence intercepted communications between Syrian military and chemical experts

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( CNN) The US military and intelligence community has intercepted communications peculiarity Syrian military members and chemical experts talking about preparations for the sarin assault in Idlib last week, a elderly US official tells CNN.

The wiretaps were part of an immediate review of all intelligence in the hours after the two attacks to demonstrate responsibility for the use of chemical weapons in an attack in northwestern Syria, which killed at least 70 beings. US officials have said that there is “no doubt” that Syrian President Bashar al-Assad is responsible for the attack.

The US did not know prior to the attack it was going to happen, government officials underscored. The US scoops up such a large volume of communications intercepts in areas like Syria and Iraq, information materials often is not processed unless there is a particular affair that requires analysts to go back and look for supporting knowledge material.