The Israeli military on Thursday said its warplanes fired on southern Lebanon after detecting Hezbollah activity at a rocket storage facility, the first Israeli airstrike a day after a ceasefire between Israel and Hezbollah took hold.

The ceasefire agreement between Israel and Hezbollah in Lebanon appears to be holding, raising hopes of a lasting respite after a 13-month border conflict that spiraled into an all-out war in September.

Israel said on Thursday that its ceasefire with Hezbollah was breached hours after Lebanese security sources said Israeli tanks attacked six areas of southern Lebanon, calling into question a truce reached after more than a year of fighting.