As a result , Voykov was forced to leave Petersburg ; in summer 1907 he was hiding in Kharkov for several months , and then emigrated .
However , a loud assassination attempt on Dumbadze revived the investigation into the case on July 20 .
Voykov was forced to leave Petersburg ; in summer 1907 he was hiding in Kharkov for several months , and then emigrated .
However , a loud assassination attempt on Dumbadze revived the investigation into the case on July 20 .