On Sunday evening, it was confirmed at least three of the deceased were Americans.
Two of those — a 51-year-old father and his 11-year-old son — were vacationing from Texas with their family.
A family friend released a statement that reads in part, "We are heartbroken and in shock over the loss of Brodie Copeland, an amazing son and brother who lit up our lives, and Sean Copeland, a wonderful husband and father. They are so loved."
A third American, Nicolas Leslie, was studying abroad through a program at the University of California at Berkeley.
"This is tragic, devastating news. All of us in the UC Berkeley family — both here on campus and around the world — are heartbroken to learn that another promising young student has been lost to senseless violence," Chancellor Nicholas Dirks said.
Just two weeks ago, another UC Berkeley student was killed in a terror attack in Bangladesh.
Authorities continue to investigate a motive for the Nice terror attack. CNN reports French authorities were interviewing as many as six people Sunday.
The driver of the truck, who police shot and killed, had a criminal record and was known to local law enforcement but was not on any watch lists.
A news agency associated with ISIS claimed the attacker was "a soldier for the Islamic State."
France's president extended a state of emergency in the country for three more months as authorities work to identify the rest of the bodies.