The bloody collapse of Libya – which triggered a refugee crisis and aided the rise of Isis – is blamed today on David Cameron’s blunders when he intervened to overthrow Colonel Gaddafi.

A damning report by MPs condemns the 2011 military campaign for lacking both “accurate intelligence” and a coherent strategy for the aftermath of removing the dictator.

The disastrous results were “political and economic collapse”, tribal warfare, the refugee crisis, widespread human rights abuses and the rise of Islamic State (IS) in North Africa, fuelled by weapons abandoned by the Gaddafi regime.

What will David Cameron do next?

The Foreign Affairs Select Committee concludes: “Through his decision-making in the National Security Council, former prime minister David Cameron was ultimately responsible for the failure to develop a coherent Libya strategy.”

The scathing verdict comes just one day after Mr Cameron’s sudden announcement that he will leave Westminster immediately, breaking an earlier pledge to stay on as a backbencher.

In the report, MPs say:

* They saw “no evidence that the UK Government carried out a proper analysis of the nature of the rebellion in Libya”.

* There was no “defined strategic objective” – which meant a limited intervention to protect civilians “drifted into a policy of regime change by military means”.

* There was no attempt to “pause military action” when Benghazi was secured and seek a deal to protect civilians and reform Libya, with the UK instead “focused exclusively on military intervention”.

* Mr Cameron should have used Tony Blair’s “contacts and influence” to try to secure Gaddafi’s exit and a “negotiated solution”.

* Many Libyans had taken part in the Iraq insurgency and fought with al-Qaeda in Afghanistan, which meant the rise of militant extremist groups “should not have been the preserve of hindsight”.

* There was “insufficient action” taken to secure weapons abandoned by the Gaddafi regime, which contributed to the turmoil and “increased terrorism” across the region.

* Mr Cameron should have been required to issue a formal “ministerial direction” to intervene, noting the Chief of the Defence Staff, Lord Richards, “dissociated himself from that decision” in evidence to the inquiry.

* France led the campaign, noting: “UK policy followed decision-taking in France”.

Just six months after sending in the RAF and the Navy, in alliance with France – after the regime threatened to attack the rebel-held city of Benghazi – a triumphant Mr Cameron was mobbed by cheering Libyans on a visit with French president Nicolas Sarkozy.

The two leaders pledged support for the future, proclaiming: “Your friends in Britain and France will stand with you as you build your country and build your democracy for the future.”

But the promise proved empty as Libya collapsed into a power vacuum, allowing Isis to seize control of part of the country and people-smugglers to send migrants towards Europe in rickety boats.

Barack Obama has called Libya the worst mistake of his presidency, apparently criticising Mr Cameron personally for the UK’s role in allowing the country to become a “s*** show”.

In pictures: Isis' Libyan stronghold of Sirte Show all 10 1 /10 In pictures: Isis' Libyan stronghold of Sirte In pictures: Isis' Libyan stronghold of Sirte Isis in Sirte Isis fighters parade through in Sirte in 2015 In pictures: Isis' Libyan stronghold of Sirte Isis in Sirte Islamic State (IS) group jihadists on the outskirts of Libya's western city of Sirte AFP/Getty In pictures: Isis' Libyan stronghold of Sirte Isis in Sirte A photo of a billboard in Sirte, Libya, listing seven rules for women's clothing, saying they must be loose-fitting and undecorated HRW/social media In pictures: Isis' Libyan stronghold of Sirte Isis in Sirte Isis militants process down a street in the coastal city of Sirte in Libya this week; the group has heralded Libya as its ‘strategic gateway’ to attack Europe AFP/Getty Images In pictures: Isis' Libyan stronghold of Sirte Isis in Sirte An Isis lecture on Sharia at the Ouagadougou complex in Sirte, Libya, in 2016. HRW/social media In pictures: Isis' Libyan stronghold of Sirte Isis in Sirte A sign reading "The city of Sirte, under the shadow of Sharia" as smoke rises in the background while forces aligned with Libya's new unity government advance on the eastern and southern outskirts of the Islamic State stronghold of Sirte on 9 June. Reuters In pictures: Isis' Libyan stronghold of Sirte Isis in Sirte Fighters loyal to Libya's GNA prepare to launch attacks against Isis as they continue their resistance on the outskirts of the western city of Sirte Getty In pictures: Isis' Libyan stronghold of Sirte Isis in Sirte Forces loyal to Libya's UN-backed unity government are seen during clashes with jihadists of the Islamic State (IS) on the western outskirts of Sirte on June 2, 2016. AFP/Getty Images In pictures: Isis' Libyan stronghold of Sirte Isis in Sirte Forces loyal to Libya's UN-backed unity government fire during clashes with Isis around 14 miles west of Sirte on June 2, 2016. AFP/Getty Images In pictures: Isis' Libyan stronghold of Sirte Isis in Libya

Crispin Blunt, the Committee’s Conservative chairman, said: “The UK's actions in Libya were part of an ill-conceived intervention, the results of which are still playing out today. Other political options were available. Political engagement might have delivered civilian protection, regime change and reform at a lesser cost to the UK and Libya.”

The international community must now get behind the United Nations-backed Government of National Accord to prevent the country descending into all-out civil war, Mr Blunt added.

Foreign and Commonwealth Office spokesman said: “The decision to intervene was an international one, called for by the Arab League and authorised by the United Nations Security Council. Muammar Gaddafi was unpredictable, and he had the means and motivation to carry out his threats. His actions could not be ignored, and required decisive and collective international action. Throughout the campaign we stayed within the United Nations mandate to protect civilians.

“After four decades of Gaddafi misrule, Libya undoubtedly faces huge challenges. The UK will continue to play a leading role within the international community to support the internationally recognised Libyan Government of National Accord.