Iran's President Hassan Rouhani warns that only Israel benefits from divisions and conflicts in the Muslim World. Speaking at the opening of the International Islamic Unity Conference in Tehran, Rouhani said terrorist groups are tarnishing the image of Islam, by committing atrocities in the name of religion. The president criticized certain Muslim countries for spending huge amounts of money on US arms, and either delivering them to militant groups or using them against other Muslim nations. The two-day gathering in Tehran will focus on the current crises in the Muslim world. The conference is being held during the Islamic Unity Week which marks the birth anniversary of Prophet Mohammad. Prominent religious figures, ministers of Islamic countries and scholars are among the participants.