Moscow attack: Putin says all four suspects arrested after 133 killed at concert hall - BBC
- Moscow attack: Putin says all four suspects arrested after 133 killed at concert hall BBC
- Appalling Moscow terror attack is a blow to Putin, who promised Russia security CNN
- Moscow concert hall attack: Putin says four gunmen arrested after at least 133 killed and dozens wounded – live updates The Guardian
- Putin vows to punish those behind Russia concert massacre Reuters
- Analysis: US warning about terror attack unheeded The Telegraph