A powerful 6.6-magnitude earthquake rocked central Italy on Sunday morning, injuring at least 20 people, in the strongest tremor to hit the country in more than three decades. Residents ran onto the streets in a panic as the quake struck at 7:40 a.m. local time (2:40 a.m. ET), and rescuers were seen in the area around crumbling historical buildings soon after, helping evacuate a group of nuns.

They worked through aftershocks that hit every 20 minutes or so. Fire and rescue services said six people were pulled from rubble in Norcia, some 6 kilometers (3.7 miles) north of the epicenter. There were no immediate reports of deaths, but civil protection chief Fabrizio Curcio warned that some villages had been cut off, and the impact there had not yet been assessed. FULL REPORT