Two children have died and other two are in a severe state in hospital as they intoxicated themselves with unknown substance. The coordinating doctor of Chisinau's Emergency Service, Anatol Proca, has told Info-Prim Neo the tragedy occurred in an apartment on Muncesti street, 145/2. Anastasia Petuscan, 13, and another 10-year-old girl, Cristina, were found dead in the apartment of the Petuscans. Anastasia's brother, Ilie, aged 12, and Maria, 6, were found alive, but in a grave state. The doctors still cannot explain the tragedy, but say there was no suspect smell in the flat. Asked Info-Prim Neo, the PR officer of the Police Commissariat, Tudor Capatina, says they don't know the cause of the children's intoxication as yet. Tudor Capatina says a number of versions are checked up. They are to verify the natural gas pipes and the toxicological record state of the parents. The victims were found intoxicated at 10.00, while their grandmother called the ambulance as late as at 15.00.