The death toll rose steadily through the early hours of Sunday as rescuers dug through the building following its collapse at around 5:30 p.m. (1630 GMT) Saturday in the city of Katowice.
Jaroslaw Wojtasik, spokesman for the fire department in Katowice, insisted the hundreds of rescuers would press on in hope of finding survivors.
But more than eight hours had passed since the last person was pulled alive from the twisted ruin of corrugated metal.
"From experience, we are making our way toward niches or hollows, or some protected places where there could still be people alive," Wojtaski said. "As long as there is hope and there is faith, then we will search the whole time, nobody will rest."
The hopes of finding survivors faded early Sunday after no one had been found alive since 10 p.m. (2100 GMT) Saturday in 1 Fahrenheit cold.
These actions in a way have come to an end and we are bringing out corpses," said Katowice fire chief Kazimierz Krzowski said at 4:30 a.m. (0330 GMT).
It wasn't clear how many more victims might still be under the building. Up to 500 people were in the exhibition center on Saturday when the roof fell in. People trapped in the wreckage used cell phones to call relatives or emergency services and tell them where they were.