Western media are expressing deep concern over security during the Sochi Olympic Games after a suicide bomber attacked a bus in the southern Russian city of Volgograd.
"A suicide bomber has killed several people and injured dozens in what appears to be the first in a promised campaign of terror against Russia ahead of the Sochi Winter Olympics," the Telegraph writes.
The campaign was promised by major militant leader Doku Umarov.
"The bombing has once again raised the macabre prospect of a terrorist attack against this February’s winter Olympics in the Black Sea resort of Sochi," the newspaper writes.
