Five hospitals have been put on high alert to take in casualties from the blast after what appeared to be two separate strikes.
Two UN peacekeepers have been injured after an Israeli tank fired towards a watchtower at a UN base in southern Lebanon, the UN says.
According to a statement by the United Nations Interim Force in Lebanon (UNIFIL), the observation tower at its headquarters in Naqoura was directly hit, causing the peacekeepers to fall.
"The injuries are fortunately, this time, not serious, but they remain in hospital," the UN says.
It adds that Israeli soldiers also fired at a UN base in Ras Naqoura, "hitting the entrance to the bunker where peacekeepers were sheltering, and damaging vehicles and a communications system".
There's more in their statement which we'll bring you shortly.
UNIFIL is a UN peacekeeping mission created in 1978. It monitors hostilities and helps to ensure humanitarian access to civilians.
Let's see how the Israeli's cope with Peacekeepers that have decentralised command and don't have to wait for someone at the home to green light to fight back.
I don't think Israel will do anything other than issue 'evacuation orders' followed by attacking 'human shields' regardless of any UN peacekeeping force. I wonder how that'll play out