If you have over 300 million people living in a country, and cancer is randomly distributed across those communities, you will have a handful of communities that have an unexpectedly high number of cancer cases, just due to random error alone. Almost none of these types of "outbreaks" ever investigated have turned up meaningful epidemiologic evidence of some harmful exposure cause. To give an idea of how common childhood cancer is, approximately 1 in 285 children in the U.S. will be diagnosed with cancer before their 20th birthday.

Are the cancer types similar?

Is there any reason to believe that these children have a different exposure history than other children?