Al-Ustaj Umbra Amiril Kato (18 May 1946 – 14 April 2015) was the founder of the Bangsamoro Islamic Freedom Fighters (BIFF) a group which seceded from Moro Islamic Liberation Front (MILF). He joined the MILF after 1985, after he graduated from Imam Muhammad bin Saud Islamic University in Riyadh, Saudi Arabia. Umbra Kato was the Philippines' most wanted man though due to his still official membership in the MILF he was not hunted by the military. However a warrant of arrest was filed against him together with other BIFF members by the Philippine National Police. The Armed Forces of the Philippines, with the MILF, launched Operation Darkhorse in a bid to arrest him in January 2014.