BEIRUT (AP) — The Israeli military struck a building in Beirut’s southern suburbs early Tuesday, killing at least four people, as the military said it had targeted a member of the Hezbollah militant group.

Israel has launched a strike on Beirut for the second time in days, further testing the shaky ceasefire with Hezbollah struck four months ago.

The attack on the outskirts of Lebanon’s capital was the second in less than a week, raising fears that a cease-fire between Israel and Hezbollah could unravel.