BEIRUT — 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.

They agree to a ceasefire in one place and not in the other? Have mercy on the children, the elderly and the women.”