A woman who said she is the neighbor of Nice attack suspect described him Friday as a frightening man and "not normal."

Officials say Mohamed Lahouaiej Bouhlel, a 31-year-old Tunisian-born Frenchman, drove a truck into crowds celebrating Bastille Day, killing dozens of people.

A woman called Hanan, who told Reuters she lives in the building believed to be the one inhabited by Bouhlel, said he was odd.

"He looked at us weirdly, he wouldn't even open the door, when we'd arrive behind he'd slam the door shut. Frankly, not normal," she said.

She described him as "a handsome man, going gray, in his 30s ... I would say he was someone who was pleasing to women."

Hanan said he was "always alone."

She added: "He didn't have a frightening face, but ... a look, a look. He would stare at the children a lot."

Forensic police searched an apartment on the first floor in the building, which is in a relatively poor neighborhood to the east of downtown Nice.