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

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.

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.