The Islamic State jihadist group has again surrounded Mount Sinjar in northern Iraq, where it trapped thousands of civilians this summer, commanders in the area said Wednesday.

The civilians, mostly members of the Yazidi religious minority, eventually escaped via Syria with the help of Kurdish fighters from Iraq's neighbour to the west, but that route has now been cut.

"The mountain is besieged" again, and IS militants are "trying to climb the mountain on foot to fight the Yazidi volunteers," said Dawud Jundi, a commander of the forces defending the area, told AFP by telephone.

The IS push began Monday, when some 300 of the militants with armoured vehicles attacked and seized nearby villages and then turned their attention on the mountain itself.

"We don't have anything but light weapons," Jundi said.

On Mount Sinjar, "there are almost 2,000 families whose situations are very bad," he said.

Mahma Khalil, a former Iraqi MP who is now another of the commanders in the area, said there were clashes on several sides of the mountain Wednesday.

The first siege of Mount Sinjar was a key moment in the conflict against the jihadist group, which spearheaded a offensive in June that has overrun large areas of Iraq.

The plight of the people trapped on the mountain helped prompt the United States to begin air strikes against the jihadists that have since been expanded into Syria and now involve a coalition of countries.

But Khalil said that there had not been any recent strikes against IS in the Sinjar area, despite intelligence passed on about the militants' locations.

Blackwater guards found guilty in 2007 Iraq 'massacre'
Washington (AFP) Oct 22, 2014 - Four former Blackwater security guards were found guilty Wednesday for their roles in a notorious 2007 mass shooting in Baghdad that left at least 14 civilians dead and deepened resentment of America's involvement in Iraq.

The four ex-employees of the US private security firm were convicted on an array of charges ranging from first degree murder to voluntary manslaughter.

Their convictions followed a two-month trial that heard how they opened fire with sniper rifles, machine guns and grenade launchers in Baghdad's bustling Nisour Square as they escorted a diplomatic convoy.

The federal court jury in Washington found Nicholas Slatten guilty of first-degree murder. Paul Slough, Evan Liberty and Dustin Heard were found guilty of voluntary manslaughter. A mistrial was declared in relation to certain counts against Heard.

"This verdict is a resounding affirmation of the commitment of the American people to the rule of law, even in times of war," US Attorney Ronald Machen said in a statement.

"Seven years ago, these Blackwater contractors unleashed powerful sniper fire, machine guns, and grenade launchers on innocent men, women, and children," he said.

- 'Outrageous attack, massacre' -

"Today they were held accountable for that outrageous attack and its devastating consequences for so many Iraqi families," Machen added.

"I pray that this verdict will bring some sense of comfort to the survivors of that massacre."

The four men were ordered detained in custody ahead of their sentencing, which is yet to be fixed. Lawyers said they would appeal.

"The verdict is wrong, incomprehensible, we're devastated but we're gonna fight every step of the way, we still think we're gonna win, we're gonna appeal," David Schertler, defense attorney for Dustin Heard, said.

Slatten, 32, faces a possible life sentence for his first degree murder conviction.

Before the killings, Slatten allegedly told acquaintances he wanted to "kill as many Iraqis as he could as 'payback for 9/11,'" according to court documents.

Slatten's three co-accused face a minimum of 15 years behind bars for each killing.

Slough, 35, was convicted of 13 counts of voluntary manslaughter and 17 charges of attempted murder. Liberty, 32, was found guilty of eight charges of voluntary manslaughter and 12 attempted murders. Heard, 33, was convicted of six voluntary manslaughter charges and 11 attempted murders.

- 'Bullet-riddled corpses' -

Iraqi officials say 17 civilians were killed in the shooting. A toll compiled by American investigators recorded 14 deaths. A further 18 Iraqis were injured.

The killings on September 16, 2007 exacerbated Iraqi resentment toward Americans in the country, and was seen by critics as an example of the impunity enjoyed by private security firms on the US payroll in Iraq.

"People who could laugh, who could love, were turned into bloodied, bullet-riddled corpses, people who were not legitimate targets... who were no real threat to them," federal prosecutor Anthony Asuncion said during the trial.

Blackwater, whose license to work in Iraq was revoked by Baghdad, was renamed Xe Services in 2009 and then Academi in 2011.

Upon President Barack Obama's arrival in office in 2009, the State Department canceled its contract with the firm.

The trial came after years of legal twists and turns in US courts.

In 2009, a US judge dismissed charges against five former Blackwater employees because certain statements they made immediately after the event could not be used against them.

Two years later, an appeals court reinstated the indictments against four defendants, opening the way for the trial in Washington.

A judge dismissed the case against Slatten in April because of a technicality. Federal prosecutors then refiled the first-degree murder charge against him several weeks later.