UN chief Ban Ki-moon called on governments on Friday to discourage pro-Palestinian activists from sending a new aid flotilla to Gaza a year after Israeli commandos killed nine people aboard a previous convoy.
The United Nations meanwhile said it was giving a panel set up to investigate last year's incident more time to finish its work. It suggested that the group, which diplomats and UN officials say has been held up by disputes between its Turkish and Israeli members, might not reach consensus.
In letters to Mediterranean governments, Ban said all aid for Gaza, which is blockaded by Israeli forces, should go through "legitimate crossings and established channels" -- which in practice in recent years has meant through Israel.
But he also called on Israel to "act responsibly" to avoid violence.
Activists say it is legal for them to send goods by sea direct to the coastal Gaza Strip. The government has said that it is justified in blocking such shipments because Palestinian militants in Gaza, which is run by Hamas, conducts military actions against Israel.
Ban said in his letters that he was concerned by reports that another attempt would be made next month to send an international aid flotilla to Gaza, UN spokesman Martin Nesirky said.
"The secretary-general called on all governments concerned to use their influence to discourage such flotillas, which carry the potential to escalate into violent conflict," Nesirky told reporters.
"He further called on all, including the government of Israel, to act responsibly and with caution to avoid any violent incident."
Last May 31, Israeli commandos intercepted a six-ship flotilla in international waters and killed nine activists -- eight Turks and a Turkish-American -- aboard the Mavi Marmara, owned by the Turkish Islamic charity IHH.
Israel said its commandos were attacked by activists wielding metal bars, clubs and knives. The incident led to a breakdown in already strained ties between Turkey and Israel.
With the anniversary of the incident looming, the Free Gaza Movement, an international pro-Palestinian activists group that includes IHH, is planning for a convoy to set out for Gaza from various parts of Europe, including Turkey.
The movement says on its website that at least 10 ships with doctors, professors, artists and journalists among those on board, as well as construction supplies and humanitarian aid, will set sail in the second half of June.
It describes the move as "an act of non-violent civil disobedience to persuade the international community to fulfill its obligations towards the Palestinian people and end Israel's four-year illegal blockade of Gaza."
Turkish Foreign Minister Ahmet Davutoglu said last week his administration had warned Turkish activists of the risks of trying to break Israel's naval blockade of Gaza, but could not prevent them from sailing, as Israel has requested.
Ban, whose letter did not mention Turkey by name, said that while flotillas were "not helpful," the Gaza situation was unsustainable and Israel should take "further meaningful and far-reaching steps" to end the territory's closure.
Ban last year appointed a panel, headed by former New Zealand Prime Minister Geoffrey Palmer and including a Turkish and an Israeli representative, to look into the Mavi Marmara affair.
The panel's report to Ban has been delayed by disagreements between Turkey and Israel over its findings, diplomats and UN officials say.
More Time for Probe
Last August, Ban appointed a four-man panel, headed by former New Zealand Prime Minister Geoffrey Palmer and including former Colombian President Alvaro Uribe and a Turkish and an Israeli representative, to look into the Mavi Marmara incident.
In a statement on Friday, Nesirky said, "All four members of the panel agreed that more time was needed for them to work on their final report, and to explore the possibility of reaching consensus on the outcome." The United Nations had never publicly specified a deadline for the group's report.
"We do not know if they will be able to reach a consensus document or not, and when," Nesirky told Reuters.
But Ban "feels that there is a greater likelihood of agreement if the panel has more time for consideration and discussion," he added.
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