Ed Miliband has paid tribute to Labour MEP candidate Del Singh, who died in a suicide bombing at a restaurant in Kabul.
The Labour leader said he was "appalled and shocked by this barbarous act of terror".
More top news
Harambe, a 400-pound ape, was shot dead on Saturday after a four-year-old boy climbed into the animal's enclosure.
A total of 8,648 sailors died during the largest naval engagement during the First World War, which marks its centenary on Tuesday.
The figures by the Global Slavery Index are a third higher than previously thought.