US missile strikes on Syria late Thursday night killed seven and wounded nine, Syrian officials claim.

Two guided missile destroyers, the USS Ross and the USS Porter, fired a total of 59 Tomahawk surface-to-surface missiles at the Al Shayrat airbase in Syria, which intelligence officials believe was used as the staging ground for Tuesday’s sarin gas attack on a suburb of Idlib.

"A total of 59 [missiles] targeted aircraft, hardened aircraft shelters, petroleum and logistical storage, ammunition supply bunkers, air defense systems, and radars," said Pentagon spokesman Jeff Davis.

The Syrian military claims seven fatalities have been reported thus far, after another Syrian official reported five deaths earlier Friday morning.

Governor of the Homs province in Syria, Talal Barazai, told Russian media Friday morning that seven people had been killed in the missile strikes, including five soldiers and two civilians from a nearby village.

A Syrian opposition monitor claimed four soldiers were killed in the attack, including a general.

No casualties have been reported among the Russian soldiers serving in Syria.

The Kremlin condemned the strikes Friday, calling them "an act of aggression" and a "violation of international law."

But the UK said it supported President Trump's "appropriate response", noting the strikes were in direct response to the sarin gas attack on Tuesday, which left as many as 100 dead and hundreds more injured.

"The UK Government fully supports the US action, which we believe was an appropriate response to the barbaric chemical weapons attack launched by the Syrian regime, and is intended to deter further attacks,” a spokeswoman for the British government said.