Sweden's U.N. ambassador says the U.S. missile attack on a Syrian air base "raises questions of compatibility with international law."

Olof Skoog told an emergency meeting of the U.N. Security Council Friday that it's important that any action is based on international law.

The United States did not seek authorization from the Security Council or the U.S. Congress, and the missile strike was not based on self-defense.

Skoog says he hopes there is enough "common ground" for the Security Council to move forward on negotiating "a strong resolution on a robust and immediate investigation" into the suspected chemical weapons attack Tuesday on a town in in northern Syria, which killed 80 people. Thursday's missile strikes were in response to that attack.