A.M. Headlines

(NBC News): "Boston Marathon blasts: Investigators eye 'range of suspects and motives"

(Voice of America): "Deadly poison found in letter sent to US senator"

(New York Times): "Seeking gun or selling one, web is the land of few rules"

(The Hill): "Obama dismisses North Korea nuclear missile threats in interview"

(CBS News): "Britain bids farewell to Margaret Thatcher"