French authorities issued arrest warrants for Telegram CEO Pavel Durov and his co-founder brother Nikolai in March, according to a French administrative document, Politico reports.

The case revolves around Telegram’s refusal to cooperate with a French police inquiry into child sex abuse.

Pavel Durov was arrested Saturday night by French police at Paris' Le Bourget airport after border officials warned judicial authorities he was arriving on his private jet from Azerbaijan.

The arrest warrants for Pavel and his brother Nikolai, Telegram’s co-founder, were issued on March 25 over charges including “complicity in possessing, distributing, offering or making available pornographic images of minors, in an organized group.”