Palestinians queue at a water distribution point in Khan Younis in the southern Gaza Strip. AFP
The nonprofit said the engineers were on their way to repair water infrastructure in southern Gaza when their "clearly-marked vehicle" was bombed in a town east of Khan Younis.
"Despite prior coordination with Israeli authorities their clearly-marked vehicle was bombed," the organization said, demanding accountability and an independent investigation into the killings.
"They were all working on essential services to keep Gaza's fragile infrastructure running. Despite their movements being coordinated with the Israeli authorities by the CMWU and the Palestinian Water Authority, to ensure their safety, they were still targeted," it added.
Oxfam did not spare the moment to call for a ceasefire in Gaza, underscoring that dozens of engineers and civil and humanitarian workers have been killed in Israeli airstrikes since the start of Israel's war on Gaza last October.
"We reiterate our calls for a ceasefire, an immediate halt to arms transfers to Israel, and the international community to ensure Israel is held accountable for its continued assault on civilians and those working to deliver life-saving services," the organization declared.
Israel's war on Gaza has so far killed more than 42,600 Palestinians, mostly women and children, according to the Palestinian health ministry.
Gaza's civil defence agency says more than 400 Palestinians have been killed in the north over the past two weeks.
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