The director of one of north Gaza‘s largest hospitals was killed, along with his wife, daughter and sister, in an Israeli strike on their apartment, medical officials said Wednesday.

Dr. Marwan Al-Sultan was the director of the Indonesian Hospital — the largest medical facility north of Gaza City and a critical lifeline for civilians in the area since the start of the nearly 21-month-long war in the territory.

Diaa Al-Najjar, Al-Sultan‘s nephew, said his uncle never stopped working amid the war, even for a moment.

„He kept resisting. Until the last second, the last moment,“ Al-Najjar told CBC News in Gaza City. „May God grant us patience and may God have mercy on our martyrs.“