Athens Embattled Greek Prime Minister Alexis Tsipras on Thursday vowed to create a new national disaster unit as the death toll from last month's deadliest-ever wildfires rose to 93."What's important today is to objectively investigate the causes of the tragedy, and take all necessary measures so that it does not happen again," Tsipras said in a televised speech as he announced a 500-million-euro ($578-million) revamp backed by European support funds."I am determined to do that," he said. (AFP)