The same week that presumptive Democratic nominee Joe Biden formally canceled plans to give a convention speech in Milwaukee, the Democratic National Convention Committee detected three positive cases of COVID-19 at the site.

“As testing increased this week, our system detected three cases which have been reported to the health department and given instructions to self-isolate,” an aide to the convention told The Daily Beast. The aide confirmed that those individuals tested positive.

Officials involved in convention planning say the decision to not host speeches from the site were not directly related to the positive test results there. But they did say that those tests underscored, for organizers, the risks that were inherent in hosting a convention in the midst of a pandemic.