The Israeli military said it had fired at people trying to return to certain areas on the second day of a ceasefire with the Hezbollah militant group.

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.

President Biden said the 60-day truce, which the United States helped broker, would take effect early Wednesday, and was intended to become permanent, ending Lebanon’s deadliest war in decades.