French authorities on Friday detained four cops suspected of beating and racially abusing a black music producer in Paris in a case that has “shocked” President Emmanuel Macron and drawn outrage from celebrities and sports stars.

Images published by the Loopsider website showed how music producer Michel Zecler was repeatedly beaten by police for several minutes and subjected to racial abuse as he tried to enter his studio on Saturday.

Celebrities including football World Cup winners Kylian Mbappe and Antoine Griezmann condemned the beating, while French star singer Aya Nakamura said she wished the producer strength.