Candles have been left in tribute to the two British medical students who were stabbed to death in Borneo.
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The five living former US presidents appeared together for the first time since 2013 to raise money for hurricane victims.
Some 465 seats are up for grabs in the lower house, which Abe dissolved last month to call a snap election amid rising approval ratings.
Ministers are also looking at schemes such as “lock-in agreements” to reduce the 250,000 sales that fall through annually.