http://hosted.ap.org/ AP Top Headlines At 8:10 p.m. EDT &copy; 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Learn more about our <a href="http://hosted2.ap.org/APDEFAULT/privacy">Privacy Policy</a> and <a href="http://hosted2.ap.org/APDEFAULT/terms">Terms of Use</a>. http://hosted.ap.org/dynamic/stories/U/US_OBAMA_NATIONAL_SECURITY?SITE=FLDAY&SECTION=HOME&TEMPLATE=DEFAULT WASHINGTON (AP) -- The Obama administration acknowledged for the first time Wednesday that four American citizens have been killed in drone strikes in Pakistan and Yemen since 2009. The disclosure to Congress comes on the eve of a major national security speech by President Barack Obama in which he plans to pledge more transparency to Congress in his counterterrorism policy.... http://hosted.ap.org/dynamic/stories/E/EU_BRITAIN_ATTACK?SITE=FLDAY&SECTION=HOME&TEMPLATE=DEFAULT LONDON (AP) -- In a brutal daylight attack which raised fears that terrorism had returned to London, two men with butcher knives hacked another man to death near a military barracks Wednesday before police wounded them in a shootout.... http://hosted.ap.org/dynamic/stories/U/US_IRS_POLITICAL_GROUPS?SITE=FLDAY&SECTION=HOME&TEMPLATE=DEFAULT WASHINGTON (AP) -- At the center of a political storm, an Internal Revenue Service supervisor whose agents targeted conservative groups swore Wednesday she did nothing wrong, broke no laws and never lied to Congress. Then she refused to answer lawmakers' further questions, citing her Fifth Amendment right not to incriminate herself.... http://hosted.ap.org/dynamic/stories/U/US_BOSTON_MARATHON_SHOOTING?SITE=FLDAY&SECTION=HOME&TEMPLATE=DEFAULT ORLANDO, Fla. (AP) -- A Chechen immigrant was shot to death by authorities early Wednesday after he turned violent while being questioned about his ties to one of the Boston Marathon bombing suspects, officials said.... http://hosted.ap.org/dynamic/stories/U/US_OKLAHOMA_TORNADO_SCHOOL_SAFETY?SITE=FLDAY&SECTION=HOME&TEMPLATE=DEFAULT MOORE, Okla. (AP) -- With its single-story design and cinder-block walls, Plaza Towers Elementary School may have seemed sturdy when it was built a couple of generations ago. But a powerful tornado revealed the building's lack of modern safety standards, destroying the school and killing seven students.... http://hosted.ap.org/dynamic/stories/U/US_BOYFRIEND_SLAYING?SITE=FLDAY&SECTION=HOME&TEMPLATE=DEFAULT PHOENIX (AP) -- Jurors in the Jodi Arias murder trial said Wednesday they were unable to reach a unanimous verdict on whether she should be sentenced to life in prison or death for killing her one-time boyfriend, prompting the judge to instruct them to keep trying.... http://hosted.ap.org/dynamic/stories/M/ML_US_SYRIA?SITE=FLDAY&SECTION=HOME&TEMPLATE=DEFAULT AMMAN, Jordan (AP) -- The U.S. and several key allies looked again Wednesday for a strategy to end Syria's civil war, their united efforts unable at the moment to stem the Assad regime's military gains and Washington still unwilling to join those providing the rebels with lethal military aid.... http://hosted.ap.org/dynamic/stories/U/US_CEO_PAY?SITE=FLDAY&SECTION=HOME&TEMPLATE=DEFAULT CEO pay has been going in one direction for the past three years: up.... http://hosted.ap.org/dynamic/stories/U/US_MED_BABYS_LAB_GROWN_AIRWAY?SITE=FLDAY&SECTION=HOME&TEMPLATE=DEFAULT In a medical first, doctors used plastic particles and a 3-D laser printer to create an airway splint to save the life of a baby boy who used to stop breathing nearly every day.... http://hosted.ap.org/dynamic/stories/U/US_OBIT_TEEN_CANCER_SONG?SITE=FLDAY&SECTION=HOME&TEMPLATE=DEFAULT LAKELAND, Minn. (AP) -- When high school student Zach Sobiech learned he didn't have much longer to live, his mother suggested he write letters to tell his loved ones goodbye. Instead, the Minnesota teenager turned to writing music - and his farewell song, "Clouds," became a YouTube sensation that has attracted more than 4 million views....