Honestly, I was bracing myself for the culprit to turn out being a white male, anti-government McVeigh-type after which we would've never heard the end of it.
I'm still surprised with the Chechnya connection though. Any other Muslim ethnicity would not surprise me but Chechens are an odd bunch. They tend to be Chechen first and Muslim second. Many of them eat pork, drink vodka and had little patience for Arab Jihadis who joined them uninvited against Chechnya's war with Russia and then tried to impose their strict interpretation of Islam upon them.
The Chechens have been radicalized in the past decade or so, they did declare the US as their enemy about the year 2000 because we “sided with Russia”.
That was until the Saudis and their Wahabbist Jihad got hold of them.