WASHINGTON (AP) — President Barack Obama said Tuesday that no stone will be left unturned in reviewing whether any sensitive intelligence was missed that could have stopped the deadly attacks on the Boston Marathon.


UNITED NATIONS (AP) — Syria's U.N. ambassador said Tuesday that the use of chemical weapons is not only "a red line" but "a blood line" that cannot be tolerated and again demanded a U.N. investigation of an alleged chemical weapons attack in Aleppo that it blames on rebels.