UNITED NATIONS, April 7 (Xinhua) -- Preliminary findings indicate Israeli tank fire and a Hezbollah explosive were likely responsible for the deaths of three Indonesian peacekeepers in Lebanon last week, a UN spokesperson said Tuesday.

The UN Interim Force in Lebanon (UNIFIL) shared the initial findings of its inquiry with the governments of Indonesia, Israel and Lebanon, said Stephane Dujarric, chief spokesperson for UN Secretary-General Antonio Guterres.

He said these are preliminary findings, based on initial physical evidence, adding that a full UN investigation continues.

"These incidents are unacceptable," he said. "We have requested with the relevant parties that the cases be investigated and prosecuted by national authorities to bring the perpetrators to justice and ensure criminal accountability for crimes against peacekeepers. Attacks on UN peacekeepers may constitute war crimes under international law."

The spokesperson said that all actors must fulfill their obligations to ensure the safety and security of peacekeepers at all times. The inviolability of UN installations must be respected.

UNIFIL paid tribute to the life and work of the fallen peacekeepers in an April 2 ceremony at Rafik Hariri International Airport, Beirut, before their remains were repatriated.

The three peacekeepers were posthumously awarded medals in recognition of their dedicated service to UNIFIL's mission in southern Lebanon.

The secretary-general earlier condemned the killings, extended his deepest condolences to the families of the fallen peacekeepers and to the government of Indonesia, while expressing appreciation for the courage and service of all men and women serving with UNIFIL.

The UN Security Council, which mandated the UNIFIL mission, also condemned the attacks in a statement, offering condolences to the victims' families and to Indonesia. Council members reaffirmed their full support for UNIFIL. ■