Celebrity chef Jose Andres told Reuters in an emotional interview on Wednesday that an Israeli attack that killed seven of his food aid workers in Gaza had targeted them “systematically, car by car.”

Speaking via video, Andres said the World Central Kitchen (WCK) charity group he founded had clear communication with the Israeli military, which he said knew his aid workers’ movements.

“This was not just a bad luck situation where ‘oops’ we dropped the bomb in the wrong place,” Andres said.

“This was over a 1.5, 1.8 kilometers, with a very defined humanitarian convoy that had signs in the top, in the roof, a very colorful logo that we are obviously very proud of,” he said. It’s “very clear who we are and what we do.”