Cameron vows to do 'everything possible' to hunt down IS post Alan Henning's execution

Terming the beheading of British aid worker, Alan Henning, by the Islamic State (IS) as "absolutely appalling," British Prime Minister David Cameron has vowed to do "everything possible" to hunt down the murderers and bring them to justice.

Following a meeting with intelligence and defence chiefs, Cameron said that the killing of Henning, who was "a man of great peace, kindness and gentleness," showed that there is no level of depravity that the group will not stoop to. He stressed on the need to defeat this group not just in the Middle East region but also at home, reported The Daily Star.

Henning was a taxi driver from Salford who had travelled to Syria as part of a humanitarian aid convoy. He was kidnapped last December and was killed despite a series of appeals by his family and influential Muslim figures at home and abroad.

He is the fourth Western hostage to be executed by the IS after James Foley, Steven Sotloff and David Haines.