"Clearly, we did not know the civilians were in the way," said IDF spokesman Jacob Dalal, who added that Israel was exercising its right to defend itself with its campaign of airstrikes. Israel reserved the right to take action against targets preparing attacks against it during the 48-hour period, an Israeli official said. Other officials called the attack a tragic mistake. Israel also arranged with U.N. officials to allow safe passage for 24 hours so residents of southern Lebanon can flee the region. The official confirmed an earlier announcement by U.S. State Department spokesman Adam Ereli, who said the bombing halt should "significantly speed and improve the flow of humanitarian aid."