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Mellanox founder Eyal Waldman’s daughter Danielle and her boyfriend Noam Shai were among those killed by Hamas militants while attending the Supernova music festival on the Israel-Gaza border Saturday, Nvidia CEO Jensen Huang said in a letter to staff.

Huang also revealed in the memo to his Israeli employees that Avinatan Or, an engineer on Nvidia’s VLSI team, and his girlfriend were among many taken hostage by Hamas, and that Jad and Nabih Amer, brothers working at Nvidia, had lost their brother Jawad Akram, an IDF soldier, in the line of duty amid this week’s Israel-Hamas conflict.