The plane's pilot and four people sheltering in the hangar from stormy weather died in the afternoon crash in Chrcynno in central Poland on Monday, firefighters said.

Eight people were injured, two of them seriously, police said. A child was among the injured.

Chrcynno is about 45km northwest of Warsaw.

Firefighters and airborne ambulances took the injured to hospitals in the Nowy Dwor Mazowiecki area.

Rescuers were still checking the hangar for additional victims, said Katarzyna Urbanowska, a spokeswoman for local firefighters.

Prosecutors and police were investigating the cause of the accident.

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.

Australian Associated Press