Hundreds of handheld pagers exploded near simultaneously across Lebanon and in parts of Syria on Tuesday, killing at least eight people, including members of the militant group Hezbollah and a girl, and wounding the Iranian ambassador, government and Hezbollah officials said. Officials pointed the finger at Israel in what appeared to be a sophisticated, remote attack that wounded more than 2,700 people at a time of rising tensions across the Lebanon border. The Israeli military declined to comment.