Seven mass graves have been found in the Sobibor extermination camp in Poland. Archaeologist Angei Kula told reporters that the graves are 20 by 25 meters in area - except for one, which is more than three times that size. All of them are five meters deep. He said that the victims were killed by bullets. The Sobibor area became forestland after World War II, and this is the first time the are has been excavated. A quarter of a million Jews were murdered in Sobibor during the Holocaust.