SAN JUAN, Puerto Rico: A 6.0-magnitude earthquake struck near Puerto Rico late Monday, rousing and scaring many from their sleep in the US territory.

The US Geological Survey said the quake struck 49 miles (79 kilometers) off the island's northwest coast at a shallow depth of 6 miles (10 kilometers). Two aftershocks, of 4.7- and 4.6-magnitude, hit within 20 minutes in the same region at the same depth.