BEIRUT (AP) Investigators began searching the wreckage of Beiruts port Wednesday for clues to the cause of the massive explosion that ripped across the Lebanese capital as the government ordered port officials put under house arrest.

International aid flights began to arrive, as Lebanons leaders struggled to deal with the aftermath of Tuesdays blast, crippled by an economic crisis and facing a public where many already blame chronic mismanagement and corruption among the ruling elite for the disaster.

The explosion at the port killed at least 100 people and wounded thousands. Hospitals were overwhelmed one that was damaged in the blast had to evacuate all its patients to a nearby field for treatment. Buildings were damaged for miles around the city, and Beiruts governor said Wednesday that hundreds of thousands might not be able to return to their homes for two or three months.