Gunman who opened fire at Sandy Hook Elementary School on Friday morning named as Adam Lanza, 20, by police sources
Lanza died at the scene 'and was carrying brother's ID'
Ryan Lanza works as an accountant at Ernst and Young in the company's Times Square office
Brother, Ryan Lanza, forced to defend himself on Facebook
Ryan Lanza was working at his desk at the Ernst and Young when he saw CNN reporting that he had killed 30 people at an elementary school in Connecticut.
It was the moment a stunned Ryan realized what his brother, Adam, might have done.
Lanza told his boss that: 'I need to go.' Then he walked out from Times Square office of the tax real-estate group, according to a co-worker who spoke to MailOnline on condition of anonymity.
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