NICE, France — When a Tunisian man drove a truck down a crowded street in Nice last week in an attack claimed by the Islamic State, more than one-third of the people he killed were Muslim, the head of a regional Islamic association said on Tuesday.

Kawthar Ben Salem, a spokeswoman for the Union of Muslims of the Alpes-Maritimes, said that Muslim funerals were being held for at least 30 of those who died during the Bastille Day attack, including men, women and children. MORE