Tensions between Israel and Hezbollah intensified on Wednesday when Israeli towns and an army base came under what appeared to be the fiercest attacks from Lebanon since the confrontation began four months ago.

The assault, presumed to be carried out by Hezbollah, prompted Israeli fighter jets to launch extensive strikes on the Iran-backed group’s positions.

The barrage of missiles from Lebanon hit the town of Safed, about 13 kilometers from the border and deeper into Israel than previous attacks by Hezbollah. The group has been trading fire almost daily with Israel since its war with Hamas erupted in October, though those skirmishes have mostly been contained to the border area.