Microsoft has fired two employees, Riki Fameli and Anna Hattle, who broke into President Brad Smith’s office during a protest against the Israeli military’s alleged use of the company’s software in Gaza.

The protest, organized by the group No Azure for Apartheid, involved employees and former employees demanding that Microsoft end its support for Israel.

Microsoft cited serious policy breaches and said it is cooperating with law enforcement, CNBC has reported.

The company is also investigating broader concerns about its technology being used for surveillance, following previous protests and arrests on its campus.