In September 1941, two Italian army medical teams were sent to investigate reports of mass graves contaminating drinking water across the Velebit mountains and on the island of Pag, all part of the Jadovno system of Ustaše camps and killing pits. This description of the Plana pit, located above the village of Buđak, on Velebit, is from the report filed by Dr. Finderle Vittori:In the area around the pit I found pieces of chains, padlocks of various sizes and shapes, railway employee badges, ribbons from trousers of Yugoslav customs officers, toothbrushes, pocket mirrors, combs, and very interestingly, emptied and torn wallets. On one spot I found pieces of a skull for which I believe to belong to an adult person between age 30 and 50, killed approximately two months before. The opening of the pit is 8x5m in size, and it seems to have no bottom. A rock I threw in did not stop, but fell so deeply that I could not hear it hit the bottom. The rim of the pit and its sides were covered with lime that seemed to be used several days before. Despite that the whole area is full of the terrible smell of decomposing corpses. It seems that around 500 victims were thrown into this pit. The Italian team discovered additional Velebit killing pits - Jamina pit, near Tribnje (hundreds of victims, including women and children), Jama na Pločama, near Stupačinovo (2.000 Serb victims), Duliba jama (200 victims), etc. Dr. Vittori notes that due to very difficult terrain and the locals not assisting out of fear of Ustashe retaliation, they were unable to locate other suspected killing pits. Beyond that, the Italian medical teams investigated the Slana and Metajna concentration camps on Pag island, part of the same system of Ustaše camps, where they dug up 791 corpses in mass graves, with nearly half being women and children, and estimated that 8 to 9 thousand were killed by the Ustaše in the camps on Pag.