WOODBURY - The Washington Navy Yard has reopened for the first time since Monday's shooting massacre.

Computer contractor Aaron Alexis killed 12 people and wounded dozens more before being killed by police.

Three separate security reviews have been ordered to find out why Alexis had high-level security clearance despite several red flags in his background.

News 12 Long Island has learned that Alexis had a sawed-off shotgun with the the cryptic messages "better off this way" scrawled on it.

Alexis' mother spoke out from her home in Brooklyn yesterday, saying she was "very sorry" about the shootings.

A memorial service for the victims is planned for Sunday.

The White House says Pres. Obama and the first lady will attend.