 He promoted his son Ahmad, allied with Suleiman ibn Yusuf, to the actual day-to-day running of affairs.They are reported to have been behind the assassination of Mas'ud I while he was imprisoned.Muhammad sent a missive to Mas'ud's son, Mawdud, in Tukharistan explaining his father's murder was an act of revenge perpetrated by the sons of Mas'ud's former general in India.