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A senior leader of the so-called Islamic State group responsible for coordinating suicide bomb attacks has been killed in a coalition air strike, the US has said.
According to the country's Department of Defence, Tariq bin Tahar al-'Awni al-Harzi was killed in Shaddadi, Syria, on June 16.
As of the end of 2013, al-Harzi had become known as Islamic State's "amir of suicide bombers", and a $3 million (£1.9m) reward was offered for information which brought him to justice.
Spokesman Captain Jeff Davis revealed 33-year-old al-Harzi had been a key player in moving people and equipment into Syria and Iraq - including suicide bombs and car-borne explosives.
[al-Harzi's] death will impact ISIL's ability to integrate foreign terrorist fighters into the Syrian and Iraqi fight as well as to move people and equipment across the border between Syria and Iraq.
His brother, Ali Awni al-Harzi, was also killed in Mosul, Iraq, the day before. He was believed to have been involved in an attack of a US diplomatic compound in Benghazi, Libya, in 2012.
Any decision on air strikes in Syria is expected to be later rather than soon, the Government has said.
ITV News Political Correspondent Carl Dinnen reports
As MPs debated the issue in the wake of the terrorist attack in Tunisia, the signs are that David Cameron will wait before going back to the Commons with a new motion, possibly when Labour have elected a new leader.
Mr Cameron's official spokeswoman said there was a need for "more thought, more deliberation, more time" before any decision was taken, although she stressed that he still believed that ultimately IS had to be dealt with in Syria.
"The PM has long thought that Isil poses a threat to Britain and Isil needs to be destroyed in Syria as well as in Iraq," she said.
"The PM's views haven't changed. What has changed is the growing evidence that Isil represents a threat to Britain and our national security."
Britain should be looking beyond air strikes if Islamic State is to be be defeated in Syria, according to a former Chief of Air Staff.
Air Chief Sir Michael Graydon said that it would "unbelievably difficult" to formulate a long-term plan for Syria but it was the only way to ensure "completing the operation properly".
Speaking to ITV News, Sir Michael added that it would be "absolutely vital that we have the proper ground support if we go into Syria."
Any action take against Islamic State in Syria must not benefit the regime of President Bashar al-Assad, Defence Secretary Michael Fallon has insisted.
Speaking to MPs, Fallon confirmed the Government would come to the Commons for approval before conducting air strikes in the country.
Backing the Prime Minister's view in September that there was a "strong case" for Britain to do more in Syria, Fallon added he knew there were reservations.
The Prime Minister recognised then the reservations that some members of this House had and we will not bring a motion to this House on which there is not some consensus," he said.
"This is of course though a new parliament and it is for all members to consider how best to tackle Isil, an evil caliphate that doesn't respect state boundaries.
"Our position therefore remains that we would return to this House for approval before conducting air strikes in Syria.
"The exception, as the House knows, is if there was a critical British national interest at stake or the need to act to prevent humanitarian catastrophe.
"But we are also clear that any action we take must not provide any succour to Assad or Assad's regime."
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Islamic State fighters stormed the Syrian town of Tel Abyad on the Turkish border and captured a neighbourhood from Syrian Kurdish YPG militia, the Syrian Observatory for Human Rights monitoring group said.
There had been heavy clashes around the town, which serves as a border crossing. Islamic State is back on the offensive in Syria after two weeks of reverses at the hands of Kurdish-led forces supported by U.S-led air strikes.
The Kurds have self-rule in parts of northern Syria and have fought intense battles against Islamic State.
The Syrian army, backed up by Kurdish People's Protection Units (YPG) have recaptured parts of the northeastern city of Hasakah, according to local media.
Isis militants still hold the south of the city, but reports suggest that they might be losing their footing.
Local activists are also claiming that former residents began to return to their homes on Sunday, after they were pushed out of the city during the Isis advance.