The Pulse: Britain on Alert & Testing an Ebola Vaccine

Nine years ago today, Hurricane Katrina roared ashore along the Gulf Coast. A category 4, with 140 mile-per-hour winds, it devastated the Mississippi and Louisiana coasts - wiping homes off their foundations. In New Orleans - the levees were no match for the rising water and fierce winds. They broke, leaving the city submerged under 20 feet of water. Katrina claimed the lives of 1800 people and caused at $125-billion in damage.

Human trials of an experimental Ebola vaccine will begin next week at the National Institutes of Health. The Food and Drug Administration gave researchers the green light after an expedited review of the vaccine. It will first be given to three healthy volunteers to see if they have any adverse effects. Then it will be given to a small group of people ages 18 to 50 to see if it produces a strong immune response to the virus.

The police response to protests in Ferguson, Missouri, is now at the center of a $40-million lawsuit. Six people filed the federal lawsuit yesterday claiming police violated their civil rights. The lawsuit asks for $40-million in damages from the city of Ferguson, Saint Louis County, as well as the county and city police departments and police chiefs. The suit accuses police of making false arrests and assault and battery in the unrest following the Ferguson police shooting of 18-year-old Michael Brown.

Ongoing fighting in the Middle East is prompting Britain to raise its terror threat level to its second highest. Prime Minister David Cameron says an attack from terror group ISIS could be "highly likely." Cameron, warning the danger ISIS poses now is the greatest his country has ever seen, calling ISIS a poisonous ideology. He ordered Britain's threat level be raised from "substantial" to "severe." That means a terrorist attack is "highly likely" but not imminent. Cameron estimates more than 500 Britons have gone to Syria and Iraq to fight with Islamic militants. The elevation of UK's threat level comes as the u-s considers military action against ISIS in Syria - air strikes, Cameron says, Britain has no plans to join.

President Obama says US airstrikes against ISIS in Iraq are working, but he does not have a strategy yet to combat the group as it gains ground in neighboring Syria. For more on this story, click the video on this page.

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