Israeli soldier dead as border tensions escalate Sunday's shooting prompted a formal Israeli complaint to UNIFIL, the UN peacekeeping force that monitors to volatile border region, which was the scene of a brutal 34-day war between Israel and Hizbollah in 2006. Israeli, Lebanese and UN military officials were to meet on Monday to discuss the incident, Moshe Ya'alon, Israel's defence minister said. "We will demand of the Lebanese army first of all an explanation as to what happened and whether this was indeed a rogue soldier; what they have done with him, and what the Lebanese army plans to do in order to prevent incidents of this kind," Mr Ya'alon said. We will not tolerate violations of our sovereignty along any border, and certainly not the Lebanese border. Several Israeli air force fighter planes were sighted flying over Sidon and other Lebanese towns on Monday, local media reported. Ban Ki-moon, the UN secretary general, said in a statement that UNIFIL was cooperating with both sides to "ascertain the facts." It was unclear whether the Lebanese sniper had been acting alone or following orders when he opened fire. Haaretz newspaper reported on its website that the sniper had initially been reported as missing after the incident - with Lebanese media speculating that he had been captured by Israel - but that he had returned to his base on Monday. The Lebanese army was carrying out an investigation, it added. Daniel Nisman, a security analyst with Max Security Solutions, a Tel Aviv-based consultancy, predicted that a broad Israeli retaliation was unlikely but said tensions in the border area with Lebanon and Syria were at their highest level since 2006. "The IDF is treating this incident as the actions of a rogue soldier," he said. I would imagine it is considering how hard the Lebanese should be hit on the head. I don't think it's the type of incident to lead to a wider conflict. But the Israeli air force could make a symbolic strike to restore deterrence. There's a false consensus that the border is still calm and that this is rare incident. In fact, it's the tensest it has been in years. Hizbollah, which is believed to have tens of thousands of rockets aimed at Israel, has blamed the Jewish state for several recent attacks against its interests - including the assassination this month of Hassan Hawlo al-Lakiss, one its most senior commanders, in a Beirut suburb. Israel has denied the allegations.