The siege of Marawi, also known as the Marawi crisis and the Battle of Marawi, was a five-month-long armed conflict in Marawi, Philippines, that started on May 23, 2017, between Philippine government security forces against militants affiliated with the Islamic State (IS), including the Maute and Abu Sayyaf Salafi jihadist groups. The battle also became the longest urban battle in the modern history of the Philippines.