MEXICO CITY (AP) — A military helicopter carrying officials assessing damage from a powerful earthquake crashed Friday in southern Mexico, killing 13 people and injuring 15, all of them on the ground. The Oaxaca state prosecutor's office said in a statement that five women, four men and three children were killed at the crash site and another person died later at the hospital. A state government official who was not authorized to be quoted by name said the chopper crashed into a group of people who had been spending the night outside after a powerful 7.2 magnitude earthquake hit the area.