QANA, Lebanon (CNN) -- Israel has agreed to suspend airstrikes on southern Lebanon for 48 hours to investigate a Sunday airstrike that killed more than 60 people in Qana, Lebanon, a U.S. State Department spokesman said. Spokesman Adam Ereli said the Israelis reserve the right to take action against targets preparing attacks against it during the 48-hour period, but the bombing halt should "significantly speed and improve the flow of humanitarian aid." Israeli officials also agreed to allow safe passage for 24 hours for residents of southern Lebanon to leave the region. Israel earlier said it mistakenly destroyed a four-story...