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The FBI has identified the dead suspect in Monday's shooting rampage at the Washington Navy Yard as Aaron Alexis, 34, a military contractor from Texas.
The next steps, said former FBI executive assistant director Shawn Henry, will be to ensure Alexis was not working with other shooters or co-conspirators.
"The way they'll do that is they'll start to – after they identify him – go out and interview people that know him, relatives, associates, business colleagues. They'll look to execute search warrants on his residence and his vehicle," said Henry.
The FBI will also get Alexis's cell phone records, and any other electronic media like computers, said Henry.
"What you really want to do is expand the scope, and make sure there are no other co-conspirators, so that you can assure there are no other plots. We have seen historically, with some of the terrorist incidents in the past, that there have been multiple plots scheduled on the same day in coordination," said Henry.
"We want to make sure that that's certainly not the case here," said Henry.