US and UN secure 72-hour Gaza ceasefire

New negotiations after US puts pressure on Israel over civilian toll

Business warns on Republicans suing Obama

Fears that move will speed implementation of healthcare reform

US diplomat faces questions over strategy

Critics say Nuland has no clear plan to end Ukraine crisis

Obama aims to re-engage with Africa

White House hosts summit to show it recognises Africa’s potential

Hopes remain of deal on Argentine debt

Private banks have been discussing buying holdouts’ bonds

Sierra Leone declares Ebola emergency

Security forces to quarantine centres of deadly virus

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