The eight were called into an Istanbul prosecutor’s office on Friday.

More than 160 officers, including former air force and navy chiefs, have been charged and jailed in a long-standing conflict between Prime Minister Recep Tayyip Erdogan’s popular government and Turkey’s secular establishment, which has long been led by the military.

Those jailed include nearly 30 active generals and admirals.

The government denies accusations that it is silencing its critics based on flimsy charges.