Five employees of the Spanish aid organization World Central Kitchen (WCK) were killed in a suspected Israeli airstrike on the Gaza Strip, Palestinian media reported.
Aid workers from Poland, Australia, Ireland and Britain were among the victims of the attack on a vehicle south of Deir al-Balah in the centre of the sealed-off coastal strip, the Times of Israel reported.
"Following the reports regarding the World Central Kitchen personnel in Gaza today, the IDF is conducting a thorough review at the highest levels to understand the circumstances of this tragic incident," the Israel Defense Forces (IDF) said in a Telegram post on Monday night.
"The IDF makes extensive efforts to enable the safe delivery of humanitarian aid, and has been working closely with WCK in their vital efforts to provide food and humanitarian aid to the people of Gaza," the military continued.
World Central Kitchen has been involved in aid deliveries for Gaza, which have been reaching the war zone by sea from Cyprus since March. The organization has also taken over the distribution of aid to the people in the strip.
The Gaza war was triggered by the unprecedented massacre with more than 1,200 deaths that militants from the Palestinian Hamas movement and other Islamist groups carried out in Israel on October 7.
Israel responded with massive airstrikes and a ground offensive. In view of the high number of civilian casualties and the catastrophic situation in the Gaza Strip, Israel has come in for increasing criticism internationally.