A 5.1-magnitude earthquake struck in the Straits of Florida off Cuba on Thursday, startling office workers in medium-rise buildings set swaying in Havana. There was no report of any damage or injuries, AP reported. The temblor occurred just before 4 p.m. about 106 miles (172 kilometers) east of Havana, according to the U.S. Geological Survey. The closest city to the epicenter was Corralillo, 17 miles (28 kilometers) to the southwest. In Old Havana, the quake was felt clearly by workers in two 6-floor buildings that were temporarily evacuated. It appeared to last around 30 seconds.