French officials had earlier said 16 other people, including family members of the attacker, were in police custody Tuesday.

The gatherings come as French authorities say they have detained an 11th person following the killing.

A man was stabbed to death in a Paris street on Friday and police have shot the suspected killer dead, a police official said.

The virus was spreading at parties and private gatherings, the president said, and action was needed now in Paris and eight other big French cities to slow the rate of infection or else hospitals risked being overwhelmed.

"Violent attack last night on the police station of Champigny with mortar shots and various projectiles. No police officer was injured," the Paris police headquarters said on Twitter.

Seven people were in custody Saturday after a stabbing outside the former Paris offices of satirical newspaper Charlie Hebdo, including the suspected assailant, authorities said.

The demonstration to mark European Heritage Days gave the hundreds of people a first-hand look at the rustic methods used 800 years ago to build the triangular frames in the nave of Notre Dame de Paris.

Trump skipped a visit to an American WWI cemetery in Paris in 2018, calling the fallen soldiers 'losers,' according to reports.

The order applies to people aged 11 and over, the Paris prefecture said in a statement, adding that indicators showed the virus had begun circulating more widely since mid-July.

Disneyland will have managed attendance, reduced capacity to support social distancing, and bolstered cleaning and disinfection of rides and spaces.