All but one of 53 Hong Kong opposition activists arrested for national security breaches were released on bail Friday without charge, police said.

Most of those arrested had been released since Thursday following the mass arrest Wednesday, when the suspects, including scholars and former lawmakers, were apprehended for plotting to overthrow the government under the sweeping anti-subversion law.

The 52 were granted police bail on conditions that included paying a cash bond and agreeing not to leave Hong Kong.