Four Israeli soldiers have been injured in an explosion along the border with Lebanon, an Israeli army spokesman said Wednesday, dpa reported.
The explosion occurred overnight while the soldiers were on patrol. The injured were taken to hospital and an investigation into the incident was launched, the army said.
Lebanon said that the explosion had been caused by a landmine and that the Israeli patrol had violated sovereign Lebanese territory.
"An infantry patrol of the Israeli army penetrated 400 metres inside Lebanon in the area of Labbouneh in the early morning hours," the Lebanese army said in a statement.
A military committee has opened an investigation in coordination with UNIFIL (United Nations Interim Forces in Southern Lebanon), according to the army.
Lebanon's caretaker Foreign Minister Adnan Mansour called the incident a "violation of Lebanon's sovereignty".
He said Lebanon would file a complaint with the UN Security Council.
The Lebanese Shiite movement Hezbollah fought the Israeli army in southern Lebanon for some two decades until Israel withdrew in 2000. The two sides fought a 34-day war in 2006.