Ukraine's Prosecutor General's Office is conducting a pretrial investigation of a criminal case pursuant to Article 365 (exceeding authority) and Article 366 (forgery) of Ukraine's Criminal Code allegedly committed by agents from the National Anti-corruption Bureau of Ukraine (NABU), PGO spokeswoman Larysa Sarhan has said.

"It's been established that NABU agents in 2016 illegally, without the necessary approvals from an investigation judge, conducted operations with measures, including surveillance of individuals' movement throughout the country and wiretapping of conversations on 114 telephones," Sarhan said on her Facebook page on Thursday.

She added that the measures were directed against members of Ukraine's Military Intelligence Directorate, the Ukrainian foreign reconnaissance service, the National Police of Ukraine, Ukraine's SBU Security Service, the Directorate of State Security, the state administration affairs office, deputy prime ministers, members of Ukraine's State Fiscal Service, high court judges, regional judge chairpersons in Kyiv, university heads and other public officials.

"A number of public officials from these agencies have been questioned. The pretrial investigation continues," Sarhan said.