Warsaw, Rajab 11, 1438, Apr 8, 2017, SPA -- An apartment house collapsed Saturday in southwestern Poland, leaving four people dead, four injured and two others missing, authorities said. Scores of firefighters with dogs were searching the rubble of the building in the town of Swiebodzice (Shvyeh-'boh-tchi-tseh), according to Daniel Mucha, regional spokesman for the firefighters. He said the collapse of two floors of the three-floor building might have been caused by a gas explosion. Regional governor Pawel Hreniak said the search-and-rescue operation was expected to continue through Sunday, AP reported. "I confirm a fourth victim, an elderly man," Hreniak told reporters. "But another resident, an elderly lady, contacted us to say she was away from the house and was fine." Still, firefighters looking for two more survivors said there were no sounds yet coming from the building's bricks and broken wood. The governor of Swiebodzice, Bogdan Kozuchowicz, said the pre-World War II building was recently renovated and had been in good technical condition. The injured were taken to hospitals in Swiebodzice and in Wroclaw. --SPA 19:27 LOCAL TIME 16:27 GMT www.spa.gov.sa/w371852