However , a loud assassination attempt on Dumbadze revived the investigation into the case on July 20 .
In addition , he left Yalta shortly after the unsuccessful explosion on July 20 , 1906 and from the autumn of 1906 studied in St. Petersburg University .
A loud assassination attempt on Dumbadze revived the investigation into the case on July 20 .
In addition , he left Yalta shortly after the unsuccessful explosion on July 20 , 1906 and from the autumn of 1906 studied in St. Petersburg University .