11.18pm BST

• 13 people, including a gunman, are dead after a shooting at the US navy yard in Washington DC. The city's mayor, Vincent Gray, confirmed the death toll at a press conference on Monday afternoon. Gray said there is "no known motive at this stage". He said officials "do not have any reason at this stage to suspect terrorism".

• The gunman has been identified as Aaron Alexis, a 34-year-old military contractor. The FBI appealed for people to come forward with details on Alexis, who had recently been living in Fort Worth, Texas. "No piece of information is too small. We are looking to learn everything we can about his movements and his associates," said assistant Valerie Parlave.

• The FBI are still hunting a potential second suspect in the shooting, authorities said. Authorities said they were trying to locate a man seen at the navy yard this morning "to determine what if any involvement he may have had". The man is described as a black male wearing an olive military–style uniform. He is between 40 and 50-years-old, approximately 5'10" with grey sideburns, according to police.

• Authorities are yet to identify any of those killed. A police officer was among those injured. He suffered injuries to "bones and blood vessels in his legs" and was in surgery on Monday afternoon, a spokeswoman from MedStar Washington Hospital Center said. The other two MedStar patients were female. One had been shot in her shoulder, the other in her head and hand. All were expected to survive.

• Alexis was remembered as a "sweet" man by customers at a thai restaurant where he worked in Fort Worth. But police in Seattle and Texas said he had been arrested twice in recent years for gun violations. In Seattle in 2004 he shot out the tyres of a vehicle in an "anger-fuelled blackout" police said. He had also been arrested in Texas after shooting a gun through the ceiling of his apartment.

• President Obama said the victims had faced "unimaginable violence" and offered his condolences to their families. "We will honour their service to the nation we helped to make great," Obama said. "Obviously we will investigate thoroughly what has happened, as we have so many of these shootings that has happened sadly." The president issued a proclamation which ordered for flags to be lowered to half-staff at all public buildings and military posts.