The staff members were from Australia, the United Kingdom and Poland, along with one U.S.-Canada citizen.
They were leaving a warehouse on Monday in an armored convoy when they were hit by three separate Israeli strikes, despite alerting Israel ahead of time.
Celebrity chef José Andrés, who founded WCK in 2010 to help feed countries stricken by crises, said Israel needs “to stop this indiscriminate killing.”
“No more innocent lives lost. Peace starts with our shared humanity,” he said in a statement. “It needs to start now.”
WCK suspended its operations in Gaza on Tuesday after the strike.
Netanyahu acknowledged the strike on WCK staff, saying “it happens in war.”
“We will do everything to prevent a recurrence,” he said, noting there was an ongoing investigation into the incident.
In the U.S., President Biden called Andrés to offer his condolences for his loss.
White House national security spokesperson John Kirby said the U.S. was “outraged” by the deaths.
“We expect a broader investigation to be conducted and to be done so in a swift and comprehensive manner,” he said. “We hope those findings will be made public and that there is appropriate accountability.”
Some progressive lawmakers were more forceful in their comments, as they have been amid the war in Gaza, where more than 32,000 Palestinians have died as Israel fights Hamas.
Sen. Bernie Sanders (I-Vt.) noted that more than 200 aid workers have died since the war began in October.
“That’s not an accident. No more aid for Netanyahu’s war machine,” he wrote on X.
Read more here.