I just hope that the current American mindset i.e. all terrorists and bombers have to be Islamists, is not applied on this straight away as it could hamstring the initial investigation - it could very well be a homegrown attack. When the Oklahoma bombing happened, the Americans initially looked eastwards and it took a little while for them to realise that the bomber was one of their own. You can see the US media already heading in the direction of Islam with the talk of "a dark skinned man" being sought, which rather ignores the fact that America is a racial mix with skins of all colours.
I don't understand how anyone can do this, never yet heard an IRA bomber explain how they can live with themselves after causing such untold horror. I know it's slightly off topic, a woman was convicted here last week of the murder of a totally innocent family man who she thought was part of a rival branch of some IRA offshoot - and not only was she proud of what she did (even though the man she murdered had no political affilliations at all, she had wrong information) but her
father was quoted as saying that he was as proud of her now as he was the day she was born
I have a friend living in Boston and emailed her last night, but she was not in the city thank goodness. Another friend has just got a job over there, but I saw he was on FB last night, so presume he is ok.