Three Chinese engineers kidnapped in southeast Turkey -sources
Turkish military has launched an operation to try to locate and rescue the engineers
U.S. prepares military options in Syria against Islamic State
USA-ISLAMICSTATE/MILITARY:U.S. prepares military options in Syria against Islamic State
Saudi Arabia jails 17 people for militant Islamist offences
Charges range from fighting in foreign conflicts to joining terrorist cells inside the kingdom
U.N. accuses Islamic State of mass killings
Persecution and systematic violations may amount to crimes against humanity and war crimes, UN rights chief has said
Undated family handout photo shows American writer Peter Theo Curtis
American writer Peter Theo Curtis is shown in this undated family handout photo provided by his cousin Viva Hardigg to Reuters on August 25, 2014. Al Qaeda-linked militants in Syria on Sunday freed Curtis, missing since 2012, following what officials said were efforts by the Gulf Arab state of Qatar to win his release. U.S. Secretary of State John Kerry said in a statement that Curtis had been held by Nusra Front, al Qaeda's official wing in Syria whose rivalry with militant group Islamic State has fueled war among the insurgents themselves. REUTERS/Handout via Reuters (UNITED STATES - Tags: POLITICS CONFLICT CIVIL UNREST MEDIA) ATTENTION EDITORS - NO SALES. NO ARCHIVES. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS
The cousin of American writer Curtis talks to reporters outside the house of Curtis' mother in Cambridge, Massachusetts
Viva Hardigg, cousin of American writer Peter Theo Curtis, talks to reporters outside the house of Curtis' mother in Cambridge, Massachusetts August 25, 2014. Al Qaeda-linked militants in Syria on Sunday freed Curtis, who has been missing since 2012, following what officials said were efforts by the Gulf Arab state of Qatar to win his release. U.S. Secretary of State John Kerry said in a statement that Curtis had been held by Nusra Front, al Qaeda's official wing in Syria whose rivalry with militant group Islamic State has fueled war among the insurgents themselves. REUTERS/Brian Snyder (UNITED STATES - Tags: POLITICS CONFLICT CIVIL UNREST MEDIA)
The cousin of American writer Curtis talks to reporters outside the house of Curtis' mother in Cambridge, Massachusetts
Viva Hardigg (R), cousin of American writer Peter Theo Curtis, talks to reporters outside the house of Curtis' mother in Cambridge, Massachusetts August 25, 2014. Al Qaeda-linked militants in Syria on Sunday freed Curtis, who has been missing since 2012, following what officials said were efforts by the Gulf Arab state of Qatar to win his release. U.S. Secretary of State John Kerry said in a statement that Curtis had been held by Nusra Front, al Qaeda's official wing in Syria whose rivalry with militant group Islamic State has fueled war among the insurgents themselves. REUTERS/Brian Snyder (UNITED STATES - Tags: POLITICS CONFLICT CIVIL UNREST MEDIA)
The mother of American writer Peter Theo Curtis briefly answers reporters' questions outside her home in Cambridge, Massachusetts
Nancy Curtis, mother of American writer Peter Theo Curtis, briefly answers reporters' questions outside her home in Cambridge, Massachusetts August 25, 2014. Al Qaeda-linked militants in Syria on Sunday freed Peter Theo Curtis, who has been missing since 2012, following what officials said were efforts by the Gulf Arab state of Qatar to win his release. U.S. Secretary of State John Kerry said in a statement that Peter Theo Curtis had been held by Nusra Front, al Qaeda's official wing in Syria whose rivalry with militant group Islamic State has fueled war among the insurgents themselves. REUTERS/Brian Snyder (UNITED STATES - Tags: POLITICS CONFLICT CIVIL UNREST MEDIA)
The cousin of American writer Curtis arrives at the house of Curtis' mother in Cambridge, Massachusetts
Viva Hardigg, cousin of American writer Peter Theo Curtis, arrives at the house of Curtis' mother in Cambridge, Massachusetts August 25, 2014. Al Qaeda-linked militants in Syria on Sunday freed Curtis, who has been missing since 2012, following what officials said were efforts by the Gulf Arab state of Qatar to win his release. U.S. Secretary of State John Kerry said in a statement that Curtis had been held by Nusra Front, al Qaeda's official wing in Syria whose rivalry with militant group Islamic State has fueled war among the insurgents themselves. REUTERS/Brian Snyder (UNITED STATES - Tags: POLITICS CONFLICT CIVIL UNREST MEDIA)
The mother of American writer Peter Theo Curtis briefly answers reporters' questions outside her home in Cambridge, Massachusetts
Nancy Curtis, mother of American writer Peter Theo Curtis, briefly answers reporters' questions outside her home in Cambridge, Massachusetts August 25, 2014. Al Qaeda-linked militants in Syria on Sunday freed Peter Theo Curtis, who has been missing since 2012, following what officials said were efforts by the Gulf Arab state of Qatar to win his release. U.S. Secretary of State John Kerry said in a statement that Peter Theo Curtis had been held by Nusra Front, al Qaeda's official wing in Syria whose rivalry with militant group Islamic State has fueled war among the insurgents themselves. REUTERS/Brian Snyder (UNITED STATES - Tags: POLITICS CONFLICT CIVIL UNREST MEDIA)