At least seven people were injured on Wednesday in a blast in northwest Pakistani town of Bannu, local sources said. They said the blast occurred near a dairy firm in Bannu Cantonment area, Pakistan's North West Frontier Province. Bannu is adjacent to the North Waziristan tribal agency. Several militants network are active in the tribal area. Pakistan security forces have moved in the past from the Bannu cantonment whenever they undertook any offensive against militants in the Bannu settled district or in adjacent tribal agency. Militants in the past have attacked over police and security forces in the city. They have also fired low-level rockets over the Bannu cantonment. 