MEXICO CITY:- A strong 6.6-magnitude earthquake struck offshore in northwestern Mexico early Sunday between the Baja California tourist resort region and Sinaloa state, but there were no immediate reports of damage. The 10-kilometer (six-mile) deep quake hit at 3:14 am (0814 GMT) and was located some 59 kilometers southwest of the Sinaloa town of Topolobampo, according to the USGS. The USGS reported an aftershock of magnitude 5.2. Temblors of magnitudes of 4.9 and 5.3 had shaken the same area less than 35 minutes before the bigger one.–AFP