The lead investigator of the catastrophic August 4 blast at the Lebanese capital's port indicted outgoing premier Hassan Diab and three ex-ministers on charges of negligence, a judicial source said Thursday. The decision by judge Fadi Sawan to indict Diab and the other ministers came after a blast probe "confirmed that they (the suspects) have received several written notices warning them against postponing the disposal of ammonium nitrate fertiliser," which authorities say was behind the August 4 blast, the source said. "They did not take the necessary measures to avoid the devastating explosion and its enormous damages," the source said. str/rh-ho