"Last year, President (Donald) Trump made clear that the use of chemical weapons crosses a red line".
Netanyahu said he told May over the phone on Saturday night that the airstrike sent "an important worldwide message of zero tolerance for the use of non-conventional weapons". "This massacre was a significant escalation in a pattern of chemical weapons use by that very awful regime".
The Israeli leader added he had spoken to the British Prime Minister Theresa May following the overnight strikes that targeted three alleged chemical weapons facilities.
The official said that Israel received the warning between 12 and 24 hours before the attack was carried out.
They "are responsible for the regional consequences of this adventurist action", it said, condemning a "clear violation of global rules and laws".
Hezbollah, like Iran and Russian Federation, is backing Assad in the war.
Israel is endorsing the decision to use military action in Syria.
"We are determined and will continue to act against the Iranian establishment of bases (in Syria)", Public Security Minister Gilad Erdan, a member of the security cabinet, said on Israel's Army Radio. "Early this morning, under American leadership, the United States, France and the United Kingdom demonstrated that their commitment is not limited to proclamations of principle", Netanyahu said in a statement released on Saturday night after the end of the Jewish Sabbath.
General Joe Dunford, chairman of the Joint Chiefs of Staff, said the strikes hit targets related to Syria's chemical weapons program - a scientific research center near Damascus, a weapons storage facility west of Homs, and a third location nearby containing a command post and an equipment storage facility.
The U.S. -led coalition Saturday launched airstrikes against Syrian targets in response to a suspected chemical attack near the capital Damascus April 7.
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