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Updated at 9:50 p.m. ET

The father and younger brother of suspected Manchester Arena suicide bomber Salman Abedi have been arrested in Libya.

It's a simple, frequently recurring phrase: "The Islamic State has claimed responsibility for the attack." But it raises some questions: Is the claim credible or just an empty assertion, and if it's true, what does "responsibility" actually entail?

Experts who closely follow the Islamic State say that in general when it comes to attacks in the West, an ISIS claim of responsibility usually means there was some sort of connection. But the attack might have been planned, funded and directed by ISIS — or it could just have been inspired by the group's propaganda.

Here at NPR headquarters in DC, MARVELous IMAGEs and FANTAstic GRAPHICS are dancing in our heads as we contemplate this year's edition of our famous Summer Reader Poll — who will make the cut? Will it be packed with old favorites or BOOM! Will a DARK HORSE muscle in?

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Two of the finest players of Irish music in the world, Martin Hayes and Dennis Cahill return to Mountain Stage, recorded live on the campus of West Virginia University in Morgantown, W.Va. With Hayes on the effervescent fiddle and Cahill taking a sparse, neo-traditional approach with his guitar, the two world-class musicians reshape the classic mode of jigs, reels and airs. As host Larry Groce puts it, "[Hayes and Cahill] have been critically praised over the top. Sometimes you get suspicious when you see that.

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