A pro-Palestinian protest by Microsoft employees interrupted the company’s 50th anniversary celebration Friday, the latest backlash over the tech industry’s work to supply artificial intelligence technology to the Israeli military.

The protest began as Microsoft AI CEO Mustafa Suleyman was presenting product updates and a long-term vision for the company’s AI assistant product, Copilot, to an audience that included Microsoft co-founder Bill Gates and former CEO Steve Ballmer.

“Mustafa, shame on you,” shouted Microsoft employee Ibtihal Aboussad as she walked toward the stage and Suleyman paused his speech. “You claim that you care about using AI for good but Microsoft sells AI weapons to the Israeli military. Fifty-thousand people have died and Microsoft powers this genocide in our region.”

“Thank you for your protest, I hear you,” Suleyman said. Aboussad continued, shouting that Suleyman and “all of Microsoft” had blood on their hands. She also threw onto the stage a keffiyeh scarf, which has become a symbol of support for Palestinian people, before being escorted out of the event.