NATO Secretary General Jens Stoltenberg said on April 14 that the alliance "considers the use of chemical weapons unacceptable."

Stoltenberg said that the strike "will reduce the regime’s ability to further attack the people of Syria with chemical weapons."

He added that "those responsible must be held accountable."

The United Nations Secretary-General, meanwhile, said he is closely watching reports related to the airstrikes on Syria conducted by three of its permanent members.

Countries are obligated to act within the guidelines of the Charter of the United Nations and "international law in general," Antonio Guterres said in a statement on April 14.

“I call on the members of the Security Council to unite and exercise that responsibility,” Guterres said.

"I urge all member states to show restraint in these dangerous circumstances and to avoid any acts that could escalate the situation and worsen the suffering of the Syrian people.”

U.S., France and Britain are set to come together with and brief NATO allies on the strikes on Syria in an emergency meeting on April 14, Reuters reported.

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