NEW : Two people killed ; several people trapped beneath collapsed buildings . The death toll from the earthquake has risen to at least 12 and more than 100 are still missing, according to local officials. Epicenter was about 20 miles southwest of port city of Patras . Athens -- about 80 miles east of the epicenter -- felt the ground shake .
NEW : Two people killed ; several people trapped beneath collapsed buildings . Strong earthquake measuring 6.1 hit southern Greece . Epicenter was about 20 miles southwest of port city of Patras . Athens -- about 80 miles east of the epicenter -- felt the ground shake .