Hundreds of thousands of people sought shelter from Hezbollah rockets fired from Lebanon into northern Israel on Sunday, the military said, as a UN official warned of imminent regional "catastrophe" from the worsening violence.

As a result, the Israeli government is restricting outdoor activities and has launched emergency guidelines for civilians

The attack, which hit the densely populated neighbourhood of Dahieh, a Hezbollah stronghold in southern Beirut, killed at least 37 people, including three children, and wounded 68 others, Lebanon’s health ministry said.