Egypt has a key role to play in countering Islamic State militants in Iraq and Syria, US Secretary of State John Kerry said on a visit to Cairo.

He said Egypt could "publicly renounce" IS ideology, reaffirming US support for Egypt's battle against Sinai militants.

Foreign fighters crossing Sinai en route for Syria are advising local militants there, US officials say.

Mr Kerry is on the last leg of his Middle East tour as he tries to form a broad coalition to tackle IS militants.

He has already enlisted the support of 10 Arab states so far but he has ruled out Iran joining the US-led coalition.

IS controls large parts of both countries and its fighters have become notorious for their brutality, but in recent weeks they have been targeted by US air strikes.

The CIA says the group has as many as 30,000 fighters in Syria and Iraq.

On Wednesday, President Barack Obama unveiled plans for an expansion of the US campaign against IS.

The 10 Arab countries to have signed up to the coalition are: Egypt, Iraq, Jordan, Lebanon, Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, and the United Arab Emirates.

France is hosting an international conference on Iraqi security on Monday as part of efforts to broaden the alliance.
Sinai jihadists

Egypt is "on the frontline of the fight against terrorism, particularly when it comes to fighting extremist groups in Sinai," Mr Kerry said, after talks with Arab League chief Nabil al-Arabi and President Abdul Fattah al-Sisi.

He acknowledged Egypt's reputation as "an intellectual and cultural capital of the Muslim world," saying it had a "critical role to play in publicly renouncing the ideology that IS disseminates".

Egyptian Foreign Minister Sameh Shukri, speaking at the same news conference, said that ties existed between IS and other militant groups operating in the region, which must also be dealt with.

BBC