Minneapolis Mayor R.T. Rybak and school Superintendent Thandiwe Peebles today assured Hmong community leaders they are working on school bus safety. The Minneapolis officials attended a gathering with Mai Chao Xiong, the mother of a kindergartner struck and killed by his school bus in April. The accident occurred shortly after the bus dropped 5 year old Kong Meng Vang at his stop. Peebles says she has been told such deaths have happened before in Minneapolis , but she says they won't happen again.