From the Czech embassy:
As many I was deeply shocked by the tragedy that occurred in Boston earlier this month. It was a stark reminder of the fact that any of us could be a victim of senseless violence anywhere at any moment.
As more information on the origin of the alleged perpetrators is coming to light, I am concerned to note in the social media a most unfortunate misunderstanding in this respect. The Czech Republic and Chechnya are two very different entities — the Czech Republic is a Central European country; Chechnya is a part of the Russian Federation.
UPDATE: Life imitates art (thanks to commenter gooners1 for the tip):
Tony Soprano: [over the phone] It’s a bad connection so I’m gonna talk fast! The guy you’re looking for is an ex-commando! He killed sixteen Chechen rebels single-handed!
Paulie ‘Walnuts’ Gualtieri: Get the fuck outta here.
Tony Soprano: Yeah. Nice, huh? He was with the Interior Ministry. Guy’s like a Russian green beret. He can not come back and tell this story. You understand?
Paulie ‘Walnuts’ Gualtieri: I hear you.
Paulie ‘Walnuts’ Gualtieri: You’re not gonna believe this. He killed sixteen Czechoslovakians. Guy was an interior decorator.
Christopher Moltisanti: His house looked like shit.