United Nations Secretary-General Antonio Guterres on Thursday said the killing of over 100 people seeking humanitarian aid in Gaza was a situation that would require an effective independent investigation.

Speaking in St. Vincent and the Grenadines ahead of a regional summit, Guterres said he was “shocked” by the latest episode in the war with Israel, in which Palestinian authorities say over 30,000 civilians have been killed since Oct. 7.

Responding to questions on the failure of a recent Security Council resolution seeking a ceasefire, Guterres said worsening geopolitical divides have “transformed the veto power into an effective instrument of paralysis of the action of the Security Council.”

Gaza health authorities say Israeli fire kills 104 waiting for aid

“I am totally convinced that we need a humanitarian ceasefire and we need the unconditional and immediate release of hostages and that we should have a Security Council able to achieve these objectives,” Guterres said.