This was after Mr Hichilema was questioned at the Force Headquarters in connection with his recent statement alleging that the PF Government had sent youth to Sudan to be trained as militias, a statement he refused to retract.
Mr Hichilema is also believed to have been questioned in relation to his recent visit to Evelyn Hone College.
One of his lawyers who accompanied him to the Police
headquarters Sakwiba Sikota hinted to journalists that the UPND leader has been charged with treason.
Mr Hichilema has since been taken to the Magistrate court were the charges against him are expected to be read out.
Earlier Police were forced to change the room were Mr Hichilema was to be questioned from, after the UPND leader refused to be interrogated from upstairs in preference for a room on the ground floor of the building.
He cited the incident last week when he together with his cadres were tear-gassed on the second floor when he was summoned at Lusaka central Police.