Manuel Valls was among a number of politicians who was booed in the wake of the truck attack in southern France which left at least 84 people dead with many more injured.
Following the attack in Nice, Mr Valls warned the French public they must learn to “live” with terrorism.
A line he regretted moments after.
He continued: “Times have changed and we should learn to live with terrorism. We have to show solidarity and collective calm. France has been hit in its soul on the 14 July, our national day.
“They wanted to attack the unity of the French nation.”
Nice resident Isabel, who declined to give her surname, said she did not boo but understood why tensions are running high.
Manuel Valls was booed as he arrived at the event
“They want him (Mr Valls) to resign because he didn’t put enough police on on the day,” said the 60-year-old.
“I was there (on Thursday) and didn’t see police.”It’s terrible to say but we need a stronger prime minister with laws against radicalism.
“I am very sad. It (the attack) has broken families apart for nothing.”
There are 85 people that remain in hospital following the attack, with 49 in serious conditions and a further 18 understood to be in a critical condition.