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’s southern suburbs were rocked by an overnight Israeli airstrike that killed at least four people, according to Lebanon’s health ministry. Israel says the strike was targeting a Hezbollah militant with links to Hamas,

Israel delayed a promised troop withdrawal in January and has continued to occupy several hilltops in south Lebanon. It has also carried out near-daily attacks on the country, claiming it was striking Hezbollah fighters and weapons.