Powerful earthquake rattles central, southern Italy

A powerful earthquake with a preliminary magnitude of 6.6 has rocked central and southern Italy, sending already quake-damaged buildings crumbling after a week of temblors that have left thousands homeless.There were no immediate reports of injuries or death. Residents already rattled by a constant trembling of the earth rushed into piazzas and streets after being roused from bed by Sunday's 7:40 a.m. quake. Nuns rushed out of their church in Norcia as the clock tower appeared about to crumble.T