The Gulf Cooperation Council on Sunday rejected claims a US-led coalition air campaign against the Islamic State group has failed following advances by jihadists in Syria and Iraq.

Speaking in Doha, after a meeting between foreign ministers of the GCC and European Union, Khalid al-Attiyah, Qatar's foreign minister, conceded that military action alone was not enough.

"The coalition is not failing but the air campaign is not enough," Attiyah, who was representing GCC countries at the meeting, told reporters.

"There are so many steps which we have to cooperate and coordinate together. To date the campaign against terror is effective.

"One of them is to enhance and expedite the dialogue in Iraq, and in Syria it is to find a way out to save the Syrian people, because they have been put between the tyranny of the regime and the brutality of the terrorist," he said.

The jihadist IS group took full control of a border crossing between Syria and Iraq on Sunday, a week after capturing the Iraqi city of Ramadi and days after seizing the ancient Syrian city of Palmyra.

The surge by a group described as the most violent in modern jihad raised further questions about the efficiency of the US-led coalition's eight-month air campaign.

EU foreign policy chief Federica Mogherini, described the latest news from Syria and Iraq, "especially" the capture of Palmyra, as "dramatic".

"Only a political solution, both in Syria and Iraq, can provide a settlement for the crisis," she said.

The day-long meeting touched on several significant areas of interest between the two sides, including the conflict in Yemen ahead of UN-brokered peace talks expected to take place next week in Geneva.

Yemeni President Abedrabbo Mansour Hadi has laid out conditions for attending Thursday's talks, namely that Iran-back Huthi rebels who overran much of the country withdraw from territory they have seized.

Saudi Arabia has been leading an air campaign against the Huthis since March 26 in a bid to restore the authority of Hadi who has fled to Riyadh with his government.

Talks in Doha also touched upon economics, with both sides saying they would continue to have discussions on establishing a free trade area between the 28-member EU and the six-state GCC.

Mogherini said trade between the EU and GCC had been growing at an "incredible rate" and reached "150 billion ($165 billion) euros last year".

The GCC groups Bahrain, Kuwait, Oman, Qatar, Saudi Arabia and the United Arab Emirates.

IS executes 16 traders on Iraqi road
Baghdad (AFP) May 24, 2015 - The Islamic State group has executed 16 Iraqi traders taking food from the city of Baiji to the government-controlled western city of Haditha, officials said Sunday.

"Daesh executed 16 Haditha traders last night," the mayor of the city, Abdelhakim al-Jughaifi, told AFP by phone.

"The victims were transporting mostly food goods, such as vegetables, from Baiji to Haditha," he said.

Baiji, which lies on the Tigris about 200 kilometres (125 miles) north of Baghdad, is under IS control.

Haditha, which sits on the Euphrates about 130 kilometres (80 miles) southwest, is the last major city in the province of Anbar still under government control.

"They were stopped at a checkpoint and abducted," the mayor said.

"They then executed them, some by shooting them, others by slitting their throats."

He said Haditha residents found the bodies on the road and were able to bring them back.

A police lieutenant colonel confirmed the 16 executions. The victims were buried on Sunday, several sources said.

Abu Maath al-Jughaifi, a tribal fighter from Haditha, said a paper was found on one of the bodies in which IS said the executions were to avenge the deaths of jihadist fighters during a recent battle near Haditha.

According to government sources, at least 23 IS militants were killed in clashes in Khasfa last week, including two French nationals who drove suicide truck bombs.

Haditha is isolated in Anbar, where IS controls the border with Syria to the west and most of the land to the east, including the provincial capital Ramadi, which they seized on May 17.

According to residents, a bag of 50 kilos of flour fetches $900 in Haditha when it only costs $20 to $30 in Baghdad.

IS has allowed some trade to continue between the regions it controls and government areas but drivers generally have to pay a fee.