The plane's pilot and four people sheltering in the hangar from stormy weather died in the afternoon crash in Chrcynno in central Poland, firefighters spokesperson Monika Nowakowska-Brynda said, AP reported.
An additional eight people were injured, two of them seriously, police said. A child was among the injured, the provincial governor, Sylwester Dabrowski, said.
Chrcynno is about 45 kilometers (28 miles) northwest of Warsaw.
It was the worst accident related to skydiving in Poland since 2014, when 11 people were killed in a crash of a small plane in Topolow, near the southern city of Czestochowa.
AMK/PR