A judge investigating the August 4 port explosion in Beirut wants to interrogate former Prime Minister Hassan Diab. Diab's government that resigned a few days after the blast that killed hundreds of people. Judge Fadi Sawan has charged him and three former ministers with negligence over the blast. But Diab says Sawan is violating the constitution by charging a prime minister and insists that his conscience is clear. There are mixed reactions to the investigation into the acting Lebanese PM's role in the explosion. Leading Lebanese political parties have condemned the charges brought against the officials.