Koehn was sentenced to life in prison.
Conservative MPs expressed concerns as sterling fell close to the 31-year-low seen in July.
Sterling has already lost 10 percent of its value overnight. And a further 10 percent drop is likely.
Three officers are dead and three wounded, with one in critical condition, as investigation continues.
One shooting suspect is dead, and the East Baton Rouge Sheriff's Office believes two are at large.
Former Baltimore mayoral candidate was among demonstrators arrested during Alton Sterling-inspired protest.
'Independent studies show that a vote to leave would hit the value of the pound, making imports more expensive and raising prices in the shops,' David Cameron says.
Scotland's blue and white flag is being flown around the UK as unionist party leaders travel north to try and persuade Scots to stay
The UK government has promised new powers and greater autonomy for Scotland if it votes to stay in the union