This Saturday evening, the inhabitants of Corbeil-Essonnes heard numerous firecrackers and smoke bombs near the Tarterêts stadium.
The spectators of the inter-district African Cup amateur football tournament (called "CAN") celebrated their team's victory in the Ivory Coast-Algeria match.
But around 9 p.m., the firecrackers moved towards a group of police nearby.
A few minutes earlier, two cars from the Corbeil-Essonnes Specialized Field Brigade (BST) checked a suspect at 29, avenue Léon-Blum, near a known deal point.
Two numbers later, at 27, another man begins to throw projectiles at the police to interfere with the intervention.
He fled to the football stadium where the CAN is played and harangues the crowd.
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The police follow him.
They then face nearly 200 spectators who turn against them.
"And this despite the intervention of two mediators on the spot who try to reason with them ..." blows a police source.
These mediators would have themselves suffered the reproaches of the crowd.
No questioning
Hostile spectators fire mortars and throw stones at the officials, who respond with tear gas canisters and defense bullet launcher fire.
They manage to retreat to the Aimé-Césaire park before leaving the neighborhood.
Calm will return thanks to the arrival of reinforcements.
No arrests were made and no officials were injured.
"Another complicated intervention for our colleagues", notes the departmental police union Alliance 91, which welcomes the "commitment" of the agents and denounces "daily violence".