(HARRISBURG, Pa.) — Children who lived closer to natural gas wells in heavily drilled western Pennsylvania were more likely to develop a relatively rare form of cancer, and nearby residents of all ages had an increased chance of severe asthma reactions, researchers said in reports released Tuesday evening.

The taxpayer-funded research by the University of Pittsburgh adds to a body of evidence suggesting links between the gas industry and certain health problems.

In the reports, the researchers found what they called significant associations between gas industry activity and two ailments: asthma, and lymphoma in children, who are relatively rarely diagnosed with this type of cancer.

The researchers were unable to say whether the drilling caused the health problems, because the studies weren’t designed to do that. Instead, the researchers combed health records to try to determine possible associations based on how close people lived to natural gas wells, while industry groups pointed to what they say are weaknesses of the studies’ assumptions and the limitations of its data.

Source: Pennsylvania Study Suggests Links Between Fracking and Asthma, Lymphoma in Children