Ecuador's interior minister said 46 police officers were detained for alleged participation in the police revolt against President Rafael Correa that claimed five lives.
A lawyer for some officers said a total of 57 were in custody and being held incommunicado.
In announcing the arrests, Interior Minister Gustavo Jalkh said prosecutors had voice recordings that indicate last Thursday's uprising went far beyond a spontaneous revolt by officers upset by a new law that would strip them of promotion bonuses.
Prosecutors said they also detained a retired army major who was at Quito's main police barracks when rebellious police roughed up and tear gassed the president.
The revolt ended when army commandos rescued Mr Correa in a hail of gunfire and concussion grenades at a hospital where he had been surrounded by insurrectionists.
But Mr Correa said yesterday that "the coup is not over.
"We will investigate all these things and try to take all precautions so there won't be a repeat," the president told reporters.
Lawyer Patricio Armijos said 57 police officers were being held at the police force's dog training unit and that authorities were not permitting the officers to talk with anyone.
Mr Armijos said the prosecutor's office notified attorneys it is starting a preliminary investigation.
"Which means that it will initiate a criminal proceeding, but we do not know the charges, the evidence or the case," he said.