Israel intensified its attacks against Lebanon on Thursday, imposing a naval blockade, twice hitting Beirut's airport, and blasting two Lebanese army air bases near Syria. Hezbollah fired more than 100 rockets into Israel, which said one also struck the port city of Haifa. The Shiite militant group denied it had rocketed Haifa, where no injuries were reported, though two days of violence elsewhere left at least 57 people dead on both sides of the border.