Judge Tarek Bitar, the second judge to lead the complicated and thorny investigation, canceled the questioning of a former military intelligence general, scheduled for Monday. Families of the victims of the explosion have already demanded an international probe, not trusting the Lebanese investigation. Lebanon is known for a culture of impunity that has prevailed for decades, including among the entrenched political elites. She said the repeated lawsuits and challenges to the judge prove that those officials are implicated in the explosion. On Friday, former Interior Minister Nouhad Machnouk, who was also implicated in the probe, filed a motion to dismiss the judge.