"This legally questionable action risks escalating further, as United States defence secretary James Mattis has admitted, an already devastating conflict and therefore makes real accountability for war crimes and use of chemical weapons less, not more likely", he warned.
It comes after Theresa May and Donald Trump agreed that the use of chemical weapons must not go unchallenged after the British Prime Minister won the backing of her Cabinet for action to prevent their further use in Syria.
The Labour leader, in a letter to the Prime Minister, thanked her for informing him the bombing raids were taking place but re-stated his view Parliament should have been consulted. And Britain should press for an independent United Nations -led investigation of last weekend's horrific chemical weapons attack so that those responsible can be held to account.
The advice read: 'There was no practicable alternative to the truly exceptional use of force to degrade the Syrian regime's chemical weapons capability and deter their further use by the regime in order to alleviate humanitarian suffering'.
"There has to be a political negotiation", she said.
Last night Labour announced that they would provide free bus travel for all citizens aged under 25, should Jeremy Corbyn's party be elected to government at the next General Election - and, after unveiling the new policy at a sixth form in Derby, it's safe to say the students there were absolutely delighted by Labour's latest promise.
But Transport Minister Jo Johnson later stressed: "There has been no decision to take military action at this point". Russia, which backs Assad's regime, described reports as a "provocation" orchestrated to justify Western military intervention in Syria and has called for the U.N. Security Council to meet Friday to discuss potential military action from Western allies.
Asked if Russian Federation or the USA posed the greatest threat to world peace, Ms Abbott said: "It's clear that at this point Russian Federation, its role in Syria, what we believe, beyond reasonable doubt, is its role in the poison gas attacks in Salisbury, is a greater threat to world peace than the United States".
A child cries as they have their face wiped following alleged chemical weapons attack, in what is said to be Douma, Syria in this still image from video obtained by Reuters on April 8, 2018.
The Syrian government denies that the alleged chemical attack took place and condemned the missile strikes as a "violation of global law".
"But it is about doing the right thing, it is about actually protecting those innocent people that the Assad regime have so little care for and are quite comfortable in terms of using chemical weapons against them".
"Theresa May should have sought parliamentary approval, not trailed after".