Turkey is holding a series of events to mark the first anniversary of a failed coup in which at least 260 people died and 2,196 were wounded.
President Recep Tayyip Erdogan will unveil a memorial on an Istanbul bridge that became a landmark of resistance and will later address parliament.
An army faction tried to seize power last July but the attempt collapsed.
The government has since dismissed more than 150,000 state employees, saying it is rooting out coup supporters.
Critics say the dismissals, and a wave of 50,000 arrests, are part of an attempt to purge dissent.