An explosion and fire at a cookie factory in central Greece killed at least four workers and left one person unaccounted for, authorities said Monday. Seven others, including a firefighter, were hospitalized after the blast at the Violanta biscuit plant near the city of Trikala, about 200 miles north of Athens. The blast occurred during the night shift, and the resulting fire gutted the plant. Fire crews battled the blaze for hours before recovering four bodies - all women - from the destroyed