 Complete the following phrase:  Sadr initially advocated for non-violence during the early stages of the Lebanese Civil War, but when a deadly explosion took place at a training camp in the Beqaa Valley, he acknowledged, in July 1975, the existence of Amal Arabic acronym for Lebanese Resistance Brigades as the military wing of the Movement of the Dispossessed. Amal grew rapidly in size, though with an increasingly weaker central command. This, in addition to the growing military presence of the Palestine Liberation Organization PLO in Shiite lands in the south and its use of methods like torture, increased tension between the two parties.ref name31113; ref At first, the Shiites, particularly the ones living in the south, were generally supportive of the PLO, to which Amal was originally allied. But relations between the PLO and Amal were further strained by the latters decision to support the Syrian intervention of 1976 against the Lebanese National Movement-PLO coalition. Sadr also drew criticism from within the Shiite community when, later in 1976, he struck a deal with Maronite Phalangist forces 