The accident happened around 11 a.m. local time (1000 GMT). The injured have been taken to hospital, Xinhua news agency reported.
Firefighting units were dispatched to the site, and rescue operations are still underway as local media reports suggest more people may have been trapped inside.
The structure had been under reconstruction.
Earlier on March 4, 2018, an apartment block collapsed in the western city of Poznan, killing four people and injuring 24 others. Residents who were not injured were taken to a nearby hotel.
On April 8, 2017, a pre-World War II apartment house collapsed in Poland, leaving five people dead, four injured and one missing.