had been messaging
Past perfect progressive conjugation of message. There are other translations for this conjugation.

message

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They detained 18-year-old Badr Ali Saiwad Al Dhohori and used his phone to trace those he had been messaging, says RSF.
Detuvieron a Badr Ali Saiwad Al Dhohori, de 18 años y usaron su teléfono para rastrear a las personas a quienes había estado enviando mensajes, dice RSF.
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