Speaking exclusively to Sky News, Queen Rania said the arrival of 1.4 million Syrian refugees into Jordan had caused "immense strain" to the country's economy.

"This crisis has had an impact on us for coming up to five years now," she said.

"We have had a wave of refugees coming into Jordan. To date we have 1.4 million Syrians in Jordan - 630,000 of them registered refugees.

"That's 20% of our population. To put that into context for you, it’s the equivalent of 12 million people coming to the UK, or 16 million going to Germany.

"It has really been an immense strain on our economy, on our public services, on our infrastructure, and it has really overwhelmed our capacity to cope with the issue."

Queen Rania said Europe must form a "consensus" on how to cope with the refugee crisis.

"What would be ideal is to seek a consensus in Europe - a holistic and cohesive policy towards dealing with the refugees," she said.

"That will encourage other nations in the world to also be part of the solution, and not to be silent bystanders to what is unfolding."

Greenville officers were following suspect Shannon Lamb when he pulled over, jumped out of his car and ran, police said.

The officers heard one gunshot and found Lamb with an apparent self-inflicted gunshot wound.

The 45-year-old was pronounced dead in hospital.

Police said Lamb had earlier told authorities that he was "not going to jail".

Officers believe Lamb killed Delta State University history professor Dr Ethan Schmidt as well as the woman Lamb lived with on the Mississippi Gulf Coast, who has been identified as 41-year-old Amy Prentiss.

Dr Schmidt's body was found in his office on Monday morning, prompting a campus-wide lockdown.

SWAT teams were seen clearing buildings and police helicopters patrolled above the school in Cleveland, about 20 miles east of the Mississippi-Arkansas state line.

The lockdown was lifted on Monday night but no classes have been planned for Tuesday.

Instead, students, faculty and staff are invited to the campus to attend a vigil in the evening to honour the murdered professor, who was 39.

In a letter to party members, the country's vice chancellor, Sigmar Gabriel, said: "Everything points to the fact that we won't have 800,000 migrants as has been predicted by the Interior Ministry, but one million."

He also called for other EU nations to take their fair share of refugees, and warned a "common European effort" to tackle the crisis is badly needed.

With the Schengen system of border-free travel through much of the continent under increasing pressure, the European Commission is to outline plans to distribute 160,000 refugees across 22 EU member states over the next two years.

Mr Turnbull's Liberal Party colleagues voted 54-44 to replace Mr Abbott during a surprise ballot on Monday.

He becomes the nation's fourth leader in a little over two years, but despite division in his party, Mr Turnbull says he will lead a "very strong government".

"There's been a change of prime minister, but we are a very, very strong government, a very strong country with a great potential and we will realise that potential working very hard together," he said.

"This is a turn of events I did not expect, I have to tell you, but it's one that I'm privileged to undertake and one that I'm certainly up to."

Shortly before Mr Turnbull was sworn in, Mr Abbott spoke for the first time since his sudden ousting.

He warned that the persistent volatility in Australia's government could hurt the nation's standing on the global stage.

This is already an intercontinental crisis but it could turn into a European catastrophe if previously open borders are shut.

It will leave tens of thousands, eventually perhaps hundreds of thousands, trapped and homeless within the confines of at least five unwelcoming countries. It will be chaos.

Over the past few days I have travelled with the refugees through the entire Balkan corridor that begins at the Greek border with Macedonia. Travelling through Macedonia and Serbia to Hungary and eventually Austria.

The sheer numbers of people walking, taking buses, trains and taxis is quite remarkable. But things could soon go badly wrong if the EU does not sort out a strategy it is legally obliged to observe.

Like it or loath it the European Union has a collective responsibility to deal with this refugee crisis. The UK and Ireland have opt-outs of course, but the rest of the countries do not, and that is now putting unprecedented stress on the Union.

One of the officials, who was speaking on condition of anonymity, said the Russian T-90 tanks and artillery have been seen at the airfield near the port city of Latakia, a stronghold of President Bashar al Assad. 

It comes following news last week that Russia has sent military hardware and troops to bolster Syria's embattled national forces.

The equipment said to have been deployed by Moscow included two tank landing ships and extra aircraft, along with a small number of naval infantry forces.

While the aim of the Russian military build-up remains unclear, a US official said last week that the purpose may be to help rebuild or defend the airfield.

Moscow has confirmed it has "experts" on the ground, but it has refused to give further details about its military presence in the country.

Damascus has denied Russian forces were involved in combat, but a Syrian official said the number of Russian "experts" had increased in the past year.

However, Syria's ambassador to Moscow has said talk of Russian troops on the ground is "a lie".

:: Refugee crisis: PM takes aim at Syria's Assad

Sky's Foreign Affairs editor Sam Kiley said: "This is consistent with a build-up of Russian forces in Syria.

"The Russians are staunch allies of the Damascus regime, but they have been helping to rebuild two significant airfields including this one outside Latakia.

"They are now defending them with these Russian-manned Russian tanks and there is also an infantry battalion of around 1,000 men that has been deployed in western Syria to defend the port of Tartus."

Last week David Cameron declared that "hard military force" was needed to reduce the number of refugees fleeing Syria.

Millions are fleeing the country "because Assad has butchered his own people and because ISIL [Islamic State] have in their own way butchered others," the Prime Minister told MPs.

"Assad has to go, ISIL has to go and some of that will require not just spending money, not just aid, not just diplomacy but will on occasion require hard military force," he added.

The Pentagon has now tracked 15 flights of Russian Antonov-124 "Condor" flights into Syria and has seen two more Russian ships offload military cargo - including half a dozen tanks - according to the latest intelligence, a defence official told Fox News.