As they gather in Saudi Arabia’s holy city of Mecca for the annual hajj, some pilgrims have denounced atrocities by Islamic State group jihadists as “a virus” threatening the world.

But many also expressed concerns about the US-led air war against them.

“Islam is innocent from actions of the Islamic State,” Kurdish Iraqi pilgrim Alan Abdullah told AFP, describing IS as “a virus threatening the whole world”.

IS has seized large parts of Iraq and Syria, declaring a Muslim “caliphate” and imposing its own harsh interpretation of Islamic law.

The jihadists have executed captured Iraqi soldiers, crucified people, forced non-Muslims to convert and beheaded Western hostages on camera.

“IS are carrying out terrorist acts, slaughtering people and causing trouble,” said another Kurdish pilgrim, Shawkat Ahmed Qader.

“Islam is far from their acts and beliefs.”

The Kurdish pilgrims are among nearly 1.4 million foreigners who have arrived in Saudi Arabia, home to Islam’s holiest sites, to follow the 1,400-year-old traditions of Islam’s Prophet Mohammed.

The hajj is the world’s largest gathering of Muslims and culminates late this week.

Kurdish fighters from northern Iraq have begun training in Germany on weapons supplied by Berlin to support the battle against IS, whose fighters closed in Monday to within a few kilometres (miles) of a key Kurdish town on Syria’s border with Turkey.

Tens of thousands of refugees have fled intoTurkey to escape the militants’ advance.

Despite supporting military action against the jihadists, Qader also lamented the unrest.

“The situation in Kurdistan is not good. We have IS from one side and the US planes bombing them from the other,” said the pilgrim in his 50s.

Washington launched air raids against IS in Syria on September 23, expanding strikes that began in August against the group’s positions in Iraq.

Arab allies Saudi Arabia, the United Arab Emirates, Bahrain, Qatar and Jordan have joined the strikes on Syrian soil, as part of an international coalition.

The Pentagon says there have been 66 bombing raids in Syria, including 23 by Arab allies.

A pilgrim from Aleppo who arrived in Mecca from Turkey criticised the US-led coalition which began its air strikes three years after civil war erupted in Syria.

More than 180,000 people have been killed in the country where many groups, including IS, are battling Syrian President Bashar al-Assad’s regime.

“We were hoping for such a coalition to end the oppression against the Syrian people and not just to hit IS or other groups,” said the pilgrim, giving his name only as Mohammed.