At least four of the Paris attackers were listed in a central counter-terrorism database maintained by the U.S. intelligence community, five U.S. officials said on Thursday. At least one and possibly more of the attackers was also on a more selective U.S. "no fly list",...

ISIS is aggressively pursuing development of chemical weapons, setting up a branch dedicated to research and experiments with the help of scientists from Iraq, Syria and elsewhere in the region, according to Iraqi and U.S. intelligence officials. Their quest raises an alarming scenario for the...

n">The mobile messaging service Telegram, created by the exiled founder of Russia’s most popular social network site, has emerged as an important new promotional and recruitment platform for Islamic State. The service, set up two years ago, has caught on in many corners of...

Serbia and Macedonia have begun limiting the passage of migrants across their borders to Syrians, Iraqis and Afghans, turning back Africans and Asians, the United Nations said Thursday. A senior police source in Macedonia, who declined to be named, said Skopje had acted after European Union...