Four suspects accused of planning terrorist attacks on the eve of the Eurovision Song Contest in Baku in May went on trial in the Azerbaijani capital on November 15.
All four are Azerbaijani citizens.
Investigators say all four cooperated with members of Iran’s elite Revolutionary Guards organization but only one of the four has been charged with spying.
Official media previously reported that some 40 members of an alleged armed terrorist group were arrested in raids in Azerbaijan early this year.
Several suspects have gone on trial in Azerbaijan in recent months for allegedly cooperating with Iran's secret service.
Based on reporting from day.az and Interfax