WARSAW, Poland—Poland’s internal security officers were searching for the source of a deadly outbreak of Legionnaires’ disease which has killed seven people and infected more than 100 others in the strategic city of Rzeszow, near the border with Ukraine, authorities said Friday.
The region of Rzeszow, in Poland’s southeast, is a key transit hub for international military support for Ukraine, following Russia’s invasion last year. Some 10,000 U.S. troops are also stationed in the area.
