UNITED NATIONS — UN chief Ban Ki-moon demanded Wednesday that Israel lift its blockade of the Gaza Strip immediately in the wake of its deadly raid on a Gaza-bound aid flotilla.
Speaking on his return from visits to Brazil, Malawi and Uganda, Ban told reporters that the underlying problem behind Monday's tragedy was the long-running, crippling Israeli siege of the tiny Palestinian coastal enclave, which he described as "counter-productive, unsustainable and wrong."
The UN secretary-general said Israeli authorities must provide a "full and detailed account" of the commando raid on six ships that tried to break the Gaza siege to deliver some 10,000 tonnes of supplies.
Israeli commandos boarded one of the aid ships in a pre-dawn raid that left at least nine passengers -- including four Turks -- dead. Hundreds of pro-Palestinian activists were also arrested.
The Israeli army said the commandos resorted to force after they were attacked with sticks and stabbed as soon as they landed on deck.
Organizers of the so-called "Freedom Flotilla" denied the military's account, saying the soldiers began firing as soon as they landed.
Ban said he was looking at "various options" to conduct a "prompt, credible, impartial and transparent" investigation of the incident, as called for by the UN Security Council.
Earlier, the Geneva-based UN Human Rights Council set up an independent international investigation into the Israeli raid.
"Everything must be done to prevent another incident of this kind," the UN boss said. "All concerned should act with a sense of care and responsibility, and in accordance with international law."
Stressing the need "to avoid provocations," Ban said the world body raised its concerns with international partners and Israeli authorities.
In recent months, Ban has consistently urged Israel to lift the blockade and allow the United Nations and other humanitarian relief supplies into Gaza.
"If this had been done, this tragedy would have been avoided," he noted.
The diplomatic Quartet seeking to bring about Middle East peace -- The European Union, Russia, the United Nations and the United States -- has stressed the need "to fundamentally improve the humanitarian situation in Gaza," according to Ban.
"In the meantime, subject to the consent of donors and without any strings attached, we will do our part so that aid from the convoy reaches its destination, as called for by the Security Council," Ban said. "We encourage all parties to be flexible to enable this to happen."
He also underscored the urgency to press on with US-brokered indirect talks between Israel and the Palestinians to reach a peace settlement.
Israel is deporting more than 600 foreign activists whose accounts of the raid contradicted Israeli reports that its soldiers acted in self-defense.
The Jewish state rushed to deport the activists after Turkey piled up pressure via the United States and warned of fresh measures against Israel, threatening to further deepen the crisis between the once-close allies.
Israeli Prime Minister Benjamin Netanyahu meanwhile insisted the Israeli blockade was key in preventing weapons from reaching Gaza. "Hamas continues to arm itself and Iran continues to transfer weapons to Hamas," the premier said.
The Jewish state withdrew from Gaza in 2005, but maintained control of all the crossings, with the exception of the Rafah border crossing, which is now policed by Egypt.
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