DUBAI (Reuters) - A statement purportedly from al Qaeda-linked militant Abu Musab al-Zarqawi says he is in Iraq, waging "holy war" against U.S.-led occupation forces to establish a Muslim state. "I am in Iraq now waging holy war with my brothers to establish a nation for Islam and a state for the Koran," said the Arabic-language statement claiming to be from Zarqawi and recently posted on Islamic Web sites. Zarqawi and his group, Jama'at al-Tawhid and Jihad, have claimed a series of suicide bombs and attacks in Iraq on U.S. troops and on Iraqi officials in recent months. Washington accuses...