Dozens of firefighters were deployed after the building was blown apart by the explosion and erupted in flames at around 6:30 p.m. on Wednesday, public broadcaster Polish Radio’s IAR news agency reported.
Rescue workers also arrived on the scene to sift through the debris in search of survivors.
By Thursday morning, rescue teams had recovered six bodies, broadcaster TVP Info reported.
Two children were among the dead, according to officials.
Prime Minister Mateusz Morawiecki was being kept informed about the rescue effort, officials said.
Up to 100 firemen, 50 police officers and other emergency service workers were on the scene, according to news reports.
Some 100 firefighters, 50 police officers and other emergency service workers were on the scene, according to news reports.
Morawiecki wrote on Twitter: "All available resources are being used to save lives after the gas explosion in Szczyrk … My thoughts go out to the families of the victims; everyone will be provided with help."
Source: IAR, TVP Info, TVN24
This is a developing story; check back for updates.