The author of the document attempts to apologize for a friendly fire incident that occurred between fighters from the Islamic State of Iraq, West Mosul Province, and Shaykh `Abad Lufan al Hadeb and his supporters. The author assures Shaykh `Abad that the incident was a mistake and reminds him that both groups are fighting a common enemy. He then offers to pay compensation for any damages that may have been inflicted.