Terrorism Threats Cast Shadow on Putin's Costly Olympics in Sochi

Fear of attack during Winter Olympics convinces Russia to coordinate security moves with United States.

SOCHI – Ten days to the opening of the Winter Olympics in Sochi and concern over a possible terrorist attack during the games is growing. In addition to a threat of suicide attacks, similar to those carried out last month in the Russian city of Volgograd, Islamist militants have posted online threats warning of chemical attacks. After...