The number of pigs killed by the African swine fever in northern Tanzania has risen from 500 to 1,155, an official has said Hezron Nonga, the Director of Veterinary Services in the Ministry of Livestock and Fisheries, on Wednesday told Xinhua in a telephone interview that out of the 1,155 killed pigs, 909 were in Kahama district, 56 in Geita district, 38 in Mbogwe district, 147 in Sengerema district, four in Kyerwa district and one in Misungwi district.