Obama: 'Our Hearts Are Broken, Too'

grief – n. deep sorrow

carnage – n. the killing of a large number of people

relentless – adj. constant, unending

first responders – n. people designated to respond quickly to emergency situations

lone wolf – n. a person who acts alone, such as a terrorist

allegiance – n. have loyalty to a person, country or group

solidarity – n. unity in feeling or actions

vengeance – n. act of doing something hurtful to someone in response to some harm or injury

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