Displaced Palestinian children play at an United Nations school in Jabaliya in the northern Gaza Strip, July 28, 2014.

Israel launched a deadly attack on a United Nations school housing refugees in Gaza despite repeated warnings that civilians were sheltering there, the U.N. has said.

State Departent Undersecretary For Political Affairs Wendy Sherman (R) and Treasury Undersecretary for Terrorism and Financial Intelligence David Cohen testify before the Senate Foreign Relations Committee about the ongoing P-5+1 talks with Iran during a hearing in the Dirksen Senate Office Building on Capitol Hill July 29, 2014 in Washington, D.C.

Lead U.S. negotiator declined to give a final deadline for final nuclear deal.

Twitter shares surged nearly 30% in after-hours trading with news that revenue for the micro-blogging site handily beat Wall Streets expectations.

Site's second-quarter revenue rose 124%, to $312 million, from the same quarter a year ago.

 Bolt has been given a soft launch and the app is currently available in New Zealand, Singapore and South Africa.

Snapchat-style app will allow users to send photos that are deleted after they are viewed.

Staff of the Christian charity Samaritan's Purse put on protective gear in the ELWA hospital in the Liberian capital Monrovia, July 24, 2014.

Philip Hammond said no Britons had been affected so far but the government was viewing the outbreak seriously.

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