"We have. evidence that proves Britain was directly involved in organizing this provocation", he said, reports BBC.
United Kingdom prime ministers do not legally need to consult Parliament before launching military action, although they have done so since the 2003 invasion of Iraq.
A French frigate, UK Royal Navy submarines laden with cruise missiles and the USS Donald Cook, an American destroyer equipped with Tomahawk land attack missiles, have all moved into range of Syria's sun-bleached coast.
"We are confident in our own assessment that the Syrian regime was highly likely responsible for this attack and that its persistent pattern of behaviour meant that it was highly likely to continue using chemical weapons", May will add.
"Cabinet agreed on the need to take action to alleviate humanitarian distress and to deter the further use of chemical weapons by the Assad regime", a spokeswoman for the prime minister said in a statement after the meeting.
General Joseph Dunford, chairman of the US Joint Chiefs of Staff, said the allied strikes destroyed three main chemical weapons facilities.
He attacked the Assad regime for "deploying chemical weapons to slaughter innocent civilians", referring to the alleged atrocity in Douma last Saturday.
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Mr Johnson said action had to be taken against Syria for the Douma attack during an appearance on The Andrew Marr Show on Sunday.
And the Russian Ambassador to Lebanon had insisted that the Russian military will not only shoot down any missiles fired at Syrian positions, but hit back at their source.
"The fact of this attack should surprise no-one".
The PM has not ruled out further action if Syria continues to use chemical weapons.
Will West's attack sway Syria's Assad?
"It is in our national interest to prevent the further use of chemical weapons in Syria - and to uphold and defend the global consensus that these weapons should not be used".
But in reality, the airfield targeted past year resumed operations shortly after the attack and, according to Western intelligence, chemical attacks resumed with impunity.
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"But I believe it should also be a message to others that the worldwide community is not going to stand by and allow chemical weapons to be used with impunity".
Whether the US, UK and France will be drawn into a bigger operation this time round remains to be seen.
Syrian state TV said the army's air defences shot down 13 missiles.
May insisted that the airstrikes on Syrian chemcial weapons facilities were "both right and legal" and were created to "alleviate further humanitarian suffering" inflicted on Syrian civilians.
But earlier on Friday, Nikki Haley, the USA ambassador to the United Nations accused Assad of using chemical weapons over 50 times during the civil war.
Nikki Haley, U.S. ambassador to the United Nations, agreed, saying, "Russia can complain all it wants about fake news, but no one is buying its lies and its cover-ups".
She also specifically linked the use of chemical weapons to Russian Federation, which she accused of blocking attempts to rein in Assad. Russian Federation won't deliberately seek big military confrontation and most likely the United States won't do this either, the expert noted.
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