TOP STORIES:

UNITED STATES-IRAQ

WASHINGTON — U.S. military and intelligence officials are voicing increasing pessimism about a key tenet of the Obama administration's strategy to dislodge the Islamic State group and stabilize Iraq. By Ken Dilanian and Robert Burns.

AP Photos.

PRESIDENTIAL RACE-CLINTON BENGHAZI

WASHINGTON — The photo that became an Internet meme — Hillary Rodham Clinton, wearing sunglasses, staring at her BlackBerry — troubles Republicans on the House committee investigating the deadly attacks in Benghazi, Libya. Chairman Trey Gowdy wants to know why the panel has no emails from Oct. 18, 2011, the day the photo was taken as Clinton, then the secretary of state, was en route to Tripoli. By Matthew Daly.

AP Photo.

With:

— PRESIDENTIAL RACE-CLINTON — Democrats closed ranks around Hillary Rodham Clinton after her public explanation of her email practices — yet party officials in important election states appeared resigned to the prospect that her all-but-certain presidential campaign will be saddled with drama and controversy. AP Photos, video.

BOSTON MARATHON BOMBING

BOSTON — Jurors in the trial of Boston Marathon bomber Dzhokhar Tsarnaev heard dramatic testimony from a Massachusetts Institute of Technology police officer who tried to save a fellow officer gunned down three days after the bombings. By Denise Lavoie.

AP Photos.

CANADA-OIL TRAIN STANDARDS

TORONTO — The Canadian government has proposed tough new standards for rail tank cars used to transport crude oil in response to a string of fiery crashes. The proposal, posted online by Transport Canada, would require the cars to have outer "jackets," a layer of thermal protection, and thicker steel walls. By Rob Gillies and Joan Lowy.

BRAZIL-SHOWER DROUGHT

RIO DE JANEIRO — Brazilians are the world's most frequent bathers, taking on average 12 showers a week. But a drought that's making taps run dry across southeastern Brazil has people worried they might be asked to cut down on their bath time. By Jenny Barchfield.

AP Photos.

CUBA-DISSIDENTS

HAVANA — The head of the Cuban dissident group the Ladies in White appeared poised to survive a referendum on her leadership following an internal dispute that sparked demands for her resignation. By Anne-Marie Garcia.

AP Photo.

BUSINESS AND FINANCE:

FED-BANK STRESS TESTS

WASHINGTON — The Federal Reserve gives the green light to major U.S. banks to raise dividends and buy back shares, deeming they have a sturdy enough financial foundation to withstand a major economic downturn. By March Gordon.

AP Photos.

ARTS & ENTERTAINMENT:

VENEZUELA-WYNTON MARSALIS

BOGOTA, Colombia — American jazz legend Wynton Marsalis has canceled a concert in Venezuela at a time of rising tensions between the two nations. By Joshua Goodman and Chartles J. Gans.

AP Photo.

ARGENTINA-HELICOPTERS CRASH

VILLA CASTELLI, Argentina — A former French Olympic skater who was participating in a reality show in Argentina says the crew was filming when their two helicopters collided and crashed, killing all 10 on board. By Paul Byrne and Natacha Pisarenko.

AP Photos, video.

SPORTS:

RIO 2016-DIRTY WATER

RIO DE JANEIRO — Rio de Janeiro's government has turned to a high-technology Dutch institute to help it try to better collect floating garbage in Guanabara Bay, the sailing venue for the 2016 Olympic Games, as officials face severe criticism over the polluted waters. By Adriana Gomez Licon.

AP Photos.