Mr. Gershkovich has been held at the notorious Lefortovo jail since his arrest on March 29 during a reporting trip to the central Russian city of Yekaterinburg. His detention was extended for three months.Mr. Gershkovich has been held at the notorious Lefortovo jail since his arrest on March 29 during a reporting trip to the central Russian city of Yekaterinburg. His detention was extended for three months.