This was announced by a spokesperson of the Main Directorate of the National Police in the Lviv region, Censor.NET reports citing Ukrainian News.
Unidentified persons doused the graves with red paint and wrote "Death to the Poles" on the central cross.
The investigative group is working at the scene. It was decided to guard the monument day and night.
On March 11, unidentified persons desecrated the monument to the Polish professors executed in 1941, installed on the Vuletski hills in Lviv.