ny daily news says that no suspects have been arrested yet. Police might just have arrested a few poeple they felt were acting suspicious or something after the blast which is understandable if they have found more undetonated ones.
Police haven't said they've arrested anyone.
I heard the report of the arrest too but you're right Boston Mayor said NO arrests have been made. Our media is reporting off the cuff it seems.
TIS
"Mankind must put an end to war before war puts an end to mankind. War will exist until that distant day when the conscientious objector enjoys the same reputation and prestige that the warrior does today." JFK