WASHINGTON: US President Donald Trump on Friday ordered meticulousness strikes in response to last weekend's chemical weapons attack.

Targeting Syrian President Bashar al-Assad's chemical weapons capabilities explosions created by the USA were heard in the Syrian capital of Damascus.

Trump said a combined operation with France and Britain was underway and that they were prepared to keep going the response until Syria stops its use of chemical weapons. The operation by the three allies came after a poison gas attack in Syria that killed at least 60 people last week.

"A short time ago, I ordered the United States Armed Forces to launch precision strikes on targets associated with the chemical weapons capabilities of Syrian dictator Bashar al-Assad," Trump said in a broadcasting address from the White House.

A US official told Reuters that strikes were aimed at several targets and caught up Tomahawk cruise missiles.

"These are not the actions of a man. They are crimes of a monster instead," Trump said referring to Pres Assad targeting his suspected role in the chemical weapons attacks.

 While British Prime Minister Theresa May said she had authorized British armed forces "to conduct co-ordinate and targeted strikes to mortify the chemical weapons capability of the Syrian regime."

However, she mentioned the military action is not about intervening in Syria's civil war or changing its regime.

On the other hand, French President Emmanuel Macron said that France had joined the US and Britain in an ongoing operation against Syria with strikes to target "the capacities of the Syrian regime to produce and use chemical weapons".