Israel launched hundreds of airstrikes in southern and eastern Lebanon on Monday, killing more than 270 people, as the Israeli military called on residents to immediately evacuate places where it claimed the Hezbollah militant group stores weapons.Thousands of people fled southern Lebanon, jamming the main highway to Beirut. More than 1,000 other people were injured in the strikes, the Health Ministry said.The Israeli military said it hit more than 800 targets Monday linked to Hezbollah weapons sites. It said it was expanding the operation to include areas of the Bekaa Valley, along Lebanons eastern border.Residents of different villages in southern Lebanon posted photos on social media that they said showed their towns that were being struck.RELATED STORY | Israel raids and shuts down Al Jazeera's bureau in Ramallah in the West BankThe wave of airstrikes came after a day after Hezbollah fired over 100 rockets into northern Israel, with some landing near the city of Haifa.Hezbollahs rockets were in response to an Israeli airstrike on a Beirut suburb on Friday that killed a top Hezbollah military commander and more than a dozen members, along with civilians including women and children.Last week, thousands of communications devices, used mainly by Hezbollah members, exploded in different parts of Lebanon, killing 39 people and wounding nearly 3,000. Lebanon blamed the attacks on Israel, but Israel did not confirm or deny its responsibilityRELATED STORY | Israel strikes Hezbollah infrastructure sites in Lebanon as conflict expandsMeanwhile, Israel Prime Minister Benjamin Netanyahu issued a warning Monday in a videotaped message his office said was aimed at Lebanese civilians. He spoke as Israeli warplanes continued to strike alleged Hezbollah targets in southern and eastern Lebanon. He urged Lebanese civilians to heed Israeli calls to evacuate their homes, saying take this warning seriously.Earlier Monday, Israel ordered residents in the targeted areas to leave ahead of the airstrikes. Israeli officials say Hezbollah uses civilian areas to hide weapons.Please get out of harms way now, Netanyahu said. Once our operation is finished, you can come back safely to your homes.