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America's decision to increase security at government buildings in Washington and elsewhere will be "continually re-evaluated" according to a statement from Homeland Security Secretary Jeh Johnson.
He adds: "The precise actions we are taking and the precise locations at which we will enhance security is law-enforcement sensitive.
"We are taking this action as a precautionary step, to safeguard U.S. government personnel and facilities, and the visitors to those facilities."
America has stepped up security at government buildings in Washington and elsewhere, citing "calls by terrorist organisations for attacks", according to the Homeland Security Secretary.
In a statement Jeh Johnson said: "Given world events, prudence dictates a heightened vigilance in the protection of US government installations and our personnel".
President Barack Obama has said that Ebola "will be defeated" but added that the world had to "stay vigilant" and be led by scientific knowledge rather than fear.
He emphasised that only two people had contracted the disease on US soil, and that both have now recovered.
He said US volunteers who go to West Africa should be "applauded, thanked and supported".
US President Barack Obama has paid tribute to the Americans working to control the Ebola outbreak in West Africa, noting that their work is "starting to have an impact".
He said he had spoken to some of the workers at the forefront of the effort who reported "some progress in Liberia".
"We don't want to discourage our healthcare workers from going to the frontline," he said, adding that the US "needs to provide support" for them when they return.
He said that Americans are "doing God's work over there" and that they must be "applauded".
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A 15-year-old who shot five classmates at a school in Washington lured them to the scene of the tragedy by text, police said.
Jaylen Fryberg, 15, invited his 'friends' to meet him in the cafeteria at Marysville-Pilchuck High School on Friday before opening fire on them.
He had earlier shot dead 14-year-old Zoe Galasso after she apparently rejected his advances.
Gia Soriano, 14, died in hospital two days after the attack while Shaylee Chuckulnaskit, 14, and Andrew Fryberg, 15, remain in a critical condition.
Nate Hatch, 14, is said to be in a satisfactory condition.
Describing the lead up to the attack, Snohomish County Sheriff Ty Trenary said: "It's our understanding he (invited them to the scene) via texting."
After shooting his friends, Jaylen Fryberg died after apparently turning the gun on himself.
New York City Mayor Bill de Blasio has confirmed doctors are awaiting test results on a five-year-old boy who was admitted to Bellevue Hospital with possible Ebola symptoms.
The preliminary test results are expected in the next 12 hours, de Blasio said.
The boy, who has not been named, was brought to Bellevue Hospital late Sunday night in an ambulance whose crew were wearing full protective gear.
The five year old and his mother had returned to New York from the Ebola-hit Guinea within the past 21 days