What to know

• Explosion of 'homemade explosive' at Moscow restaurant killed three and injured 21 on Saturday evening. Russia's national anti-terrorism committee says it's a bombing.S1
• At least three people have been killed and 21 injured after a homemade explosive device was detonated at an Italian restaurant in Moscow, Russian officials said. Local authorities have not said anything about who they believe was the target of the attack.S2
• ​At least three people were killed and 21 others injured after a homemade bomb exploded outside an upscale restaurant in central Moscow on Saturday evening, Russian authorities said. According to officials, the blast occurred shortly before 8:00 p.m. local tim...S3