This follows his arrest on Saturday at his Lukenya home in Machakos county by officers from the Directorate of Criminal Investigations.
Authorities say the arrest was in connection with his suspected involvement in the coordination and facilitation of acts deemed to constitute terrorism.
Detectives said they recovered several electronic devices and documents during the operation. Authorities allege that Mwangi played a key logistical and financial role in the June 25 protests, during which scores were killed, public property was destroyed, and security officers injured.
The arrest has sparked widespread criticism from civil society groups and human rights defenders, who accuse the state of using terrorism laws to criminalise dissent.
The state through the Director of Public Prosecutions is expected to seek custodial orders as has often been the case when suspects are charged.
Elsewhere at the High Court in Milimani, Justice Chacha Mwita is expected to give directions in a case where the family of missing Wajir Huduma Centre boss Abdirahman Hussein has sought to have their kin produced in court dead or alive.
Hussein went missing last week and is thought to have been abducted by unknown individuals.
Set to also appear in court today
Wajir Huduma boss—the court is to give directions in the case of missing Wajir Huduma boss Hussein Abdirahman.
KNH patient who is believed to have killed another and the former Migori Governor Zachary Obado anti-corruption case.
