According to the prosecutor’s office, it's because they're accused of having links to the network of US-based cleric Fethullah Gulen.
Ankara says it was him who orchestrated a 2016 attempted coup.
Those who are facing jailtime include three colonels, eight majors and 10 lieutenants.

Explosion hits US embassy in Oslo, causing minor damage, thick smoke
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Drone attacks cause major fire at Kuwait International Airport
Israel warns Lebanon of 'heavy price' as week's death toll nears 300
Trump rejects settling war with Iran
