Sheikh Sabah al-Ahmad al-Sabah chairs the opening of the 42nd Session of the Council of Foreign Ministers of the Organisation of Islamic Corporation at Bayan palace in Kuwait City on Wednesday.

AFP/Kuwait City

Muslim countries must increase measures to fight extremism, Kuwait's emir said on Wednesday, at the start of a conference aimed at combating the spread of jihadist organisations such as the Islamic State group.

"We are required to intensify efforts with the world to combat terrorism being waged by terrorist organisations," Sheikh Sabah al-Ahmad al-Sabah said at a conference of the Organisation of Islamic Cooperation (OIC).

"We need to take a serious stand against sectarian tensions plaguing and dividing our nations... It is the most serious (threat) against the very existence of Muslim countries," the Kuwaiti emir said.

Iran, Turkey and Saudi Arabia are among countries attending the conference, which is expected to see the 57-member OIC approve an "effective strategy to combat terrorism, violent extremism and Islamophobia," the organisation said.

The strategy, expected to be approved later on Wednesday, will focus on Islamic world responses to the root causes of "terrorism", including poverty, underdevelopment, unresolved conflicts and sectarianism, the OIC said in a statement.

Saudi Arabia was itself the scene of a suicide bombing by extremists against a Shia mosque that killed 21 people during Friday prayers last week.

Sheikh Sabah defended the Saudi-led airstrikes against Yemen's Shia Houthi rebels and their allies after they "threatened our security and stability and captured power by force".

He also urged Iran to cooperate with the international community to resolve the dispute over its nuclear programme and to respond to efforts by countries in the region to establish closer ties.

In a letter published in Kuwaiti newspapers Wednesday, Iranian Foreign Minister Mohammad Javad Zarif, who is attending the meeting, said his country was prepared to engage in dialogue in order to resolve the region's several conflicts.

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