April 19 (UPI) -- Trials started in İstanbul for 189 people, including students, journalists and lawyers, for their involvement in protests in March against the Turkish government spurred on by the arrest of the city's mayor. The Istanbul prosecutor's office said it plans to put 819 people on trial in 20 criminal investigations after police detained nearly 2,000 people in the protests between March 19 to 26 , with the first mass trials starting Friday. The opposition Republican People's Party,