A moderate earthquake with a preliminary magnitude of 4.7 struck southern Sweden early Tuesday, experts said. No injuries or damage were immediately reported. The US Geological Survey said the temblor was centered 25 miles (40 kilometers) east of Malmo, Sweden's third largest city. The quake hit at 6:20 a.m. (0520GMT) and could be felt in Denmark's capital, Copenhagen, across the Oresund strait. Earthquakes of that magnitude are very rare in the region, experts said. "This is probably the biggest earthquake in Sweden since 1904," Uppsala University seismologist Reynir Bodvarsson told Swedish Radio.