NEW : Officials described the quake as an aftershock of the 7.4-magnitude temblor which struck in the same area on March 20 , damaging hundreds of homes . The earthquake is an aftershock of a 7.4-magnitude quake that struck March 20 . The quake 's epicenter was about 17 miles from Ometepec , Guerrero . MEXICO CITY (AP) — Residents in Mexico City felt the temblor .
NEW : The earthquake is an aftershock of a 7.4-magnitude quake that struck March 20 . The quake 's epicenter was about 17 miles from Ometepec , Guerrero . MEXICO CITY (AP) — Residents in Mexico City felt the temblor .