Abdelbaki Es Satty (Arabic: عبدالباقي إس ستي; 1973 – 16 August 2017) was a Moroccan imam in Ripoll, Spain.[1][2][3] On 21 August, he was confirmed to have died in an accidental explosion in Alcanar on 16 August, which began the 2017 Barcelona attacks.[4][5] Satty is believed to have been the mastermind of the planned attacks and to have radicalised the twelve terrorists responsible into the Takfir wal-Hijra sect, which allows adherents to copy typically "Western" behaviour often forbidden in Islam in order to conceal their radicalisation and terror plans.[6] However, he was also serving as an informant to Spain's intelligence agency, CNI.[7]