Officials say no evidence of second shooter in Washington rampage

WASHINGTON (Reuters) - Investigators have found no evidence of a second suspect in the shooting spree at the Washington Navy Yard that killed 13 people, including suspected gunman Aaron Alexis, officials told a news conference on Monday.

"We have continued to pursue the possibility of there being another shooter but we don't have any evidence, any indication, at this stage that there was another shooter," Washington Mayor Vincent Gray said.