UN Secretary-General Antonio Guterres has called for independent investigations into the deaths of all 196 aid workers killed in the Gaza Strip during the Israel-Hamas fighting and said he hopes Israel quickly and effectively boosts aid access, Reuters reports.

“The Israeli government has acknowledged mistakes,” Guterres said. “But the essential problem is not who made the mistakes, it is the military strategy and procedures in place that allow for those mistakes to multiply time and time again.”

“Fixing those failures requires independent investigations and meaningful and measurable changes on the ground,” he said, without specifying who should conduct the investigations.

“196 humanitarian workers have been killed and we want to know why each one of them was killed.”