David Cameron called for the next wave of international development targets to focus on extreme poverty.
The Prime Minister, in Liberia to attend a UN meeting, also insisted bolstering security and civil structures was crucial, alongside aid measures.
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The embattled Labour leader said the party had "not done enough" to win back voters' trust, and that he will "finish the job".
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ATM machines were affected, while people also reported problems using cards in shops.