Quake near Oklahoma oil hub causes substantial damage

CUSHING, Okla. -- A magnitude 5.0 earthquake centered near one of the world's key oil hubs brought down building facades and shattered windows in a central Oklahoma city, rendering century-old buildings unsafe and raising concerns about key infrastructure.As the sun rose Monday, television news footage showed widespread, substantial damage to buildings, with piles of bricks and other debris littering the ground following the earthquake the previous evening. Cushing Assistant City Manager Jeremy