As U.S.-backed forces fight their way through the Islamic State stronghold of Raqqa, the coalition is facing mounting allegations of civilian casualties from its airstrikes on the jihadist group in Syria and Iraq. In a detailed timeline of a March attack on a mosque in the northern Syrian town of Jinah, the commission said the coalition had neither taken appropriate measures to protect civilians nor provided evidence to back up its claim that the mosque was being used as a meeting place for senior al-Qaida leaders.