caught in the act
Nous l'avons pris en flagrant délit.
We caught him red-handed.
Sans flagrant délit ou sans pièce à conviction, rien à faire !
Without being caught in the act or without evidence, there's nothing to be done!
— Le Voleur de bicyclette (1948)
Ils l'ont pris en flagrant délit.
They caught him in the act.
Flagrant délit de non-respect de l'uniforme.
Caught in the act of violating the uniform policy.
— Moonrise Kingdom (2012)
La police arrêta le pickpocket en flagrant délit.
The police arrested the pickpocket red-handed.