A strong 6.8-magnitude earthquake struck southeast Cuba on Sunday, causing damage and landslides in towns near the epicenter, according to residents and local officials. No tsunami warnings were issued. The earthquake, which struck at 11:49 a.m. local time, was centered in the ocean about 25 miles (40 km) south of Bartolomé Masó, a town in Granma Province, or 27 miles (43 km) southeast of Pilón. The U.S. Geological Survey (USGS) said the earthquake had a magnitude of 6.8 and struck just 9 miles (14 kilometers) below the ocean floor. It followed a 5.9-magnitude earthquake exactly one hour earli…