奥巴马参加了受到校园枪击案震撼的小镇的悼念遇害者的烛光晚会

U.S. President Barack Obama has vowed to use all his power to make sure that tragedies like Friday's killing of 20 children and six adults at an elementary school are never repeated.

Mr. Obama joined mourners Sunday night in ((the northeastern town of)) Newtown, Connecticut where a gunman's rampage killed the 26 people.  He told those gathered for a nighttime vigil for the victims that they are not alone in their grief.  The president said people across the country are mourning with them.

Mr. Obama said the nation is left with hard questions after the shooting.  He noted this was the fourth mass shooting incident that has occurred since the start of his presidency almost four years ago.

Earlier in the evening, the president met privately with the families of those who lost loved ones at Sandy Hook Elementary School, and to thank the first responders to the tragedy.