The Hoover Dam, in the Black Canyon of the Colorado river on the border between Arizona and Nevada, impounds Lake Mead, the largest reservoir in the US by volume. More from Eyewitness » 

Photograph: Joe Klamar/AFP/Getty Images

The Double Down sandwich from KFC is back: ‘This is meat personified’ 

KFC relaunched its controversial sandwich on Monday, four years after the nation’s arteries were first subjected to the infamous fried chicken and bacon and cheese concoction. Read more »

2014 Boston Marathon – in pictures

A runner with a temporary Boston Marathon tattoo gets ready to run. Photograph: Andrew Burton/Getty Images

CIA torture architect breaks silence to defend ‘enhanced interrogation’

The psychologist regarded as the architect of the CIA’s “enhanced interrogation” program has broken a seven-year silence to defend the use of torture techniques against al-Qaida terror suspects in the wake of the 9/11 attacks.

In an uncompromising and wide-ranging interview with the Guardian, James Mitchell was dismissive of a Senate intelligence committee report on CIA torture in which he features, and which is currently at the heart of an intense row between legislators and the agency. Read more

Photograph: US Department of Defense/AP

Ukraine talks ‘reach deal’ on defusing crisis - live coverage

The Geneva meeting on the situation in Ukraine agreed on initial concrete steps to de-escalate tensions and restore security for all citizens.

All sides must refrain from any violence, intimidation or provocative actions. The participants strongly condemned and rejected all expressions of extremism, racism and religious intolerance, including anti-semitism.

– Geneva joint statement.

Follow the latest developments

Photo: Imago/Barcroft Media

The deportees with nowhere to go

Just under 60,000 undocumented migrants were deposited in Tijuana, Mexico, from the US last year. Guardian photographer Felix Clay has been to Tijuana to document the deportees, soup kitchens and the homes of those who had built a life in America. See more

Lawyers for the accused Boston Marathon bomber are due to ask a judge to dismiss some of the charges against him and to ease restrictions on him in prison.

Lawyers for Dzhokhar Tsarnaev will also ask the judge to order prosecutors to hand over more information on the defendant’s family as they seek to build a case that could limit his blame for the attack. Full story

Boston marks first anniversary of Marathon bombing with day of tributes

Bells tolled across city at 2.49pm to mark the moment of the first blast, while ceremonies were attended by survivors and victims’ families. Read more

Photograph: Bill Sikes/AP

Three killed after shootings at Jewish centres in Kansas

A 73-year-old man opened fire outside a Jewish centre and nearby retirement community in Kansas City on Sunday, killing three people including a 14-year-old boy, police said.

The suspect was identified as Frazier Glenn Cross by authorities in Kansas, and by the Southern Poverty Law Center as Frazier Glenn Miller, a longtime anti-Semite who is the former grand dragon of the Carolina Knights of the Ku Klux Klan. Full story 

Photograph: John Sleezer/AP

Top 10 historic sights in San Francisco

San Francisco has iconic landmarks aplenty: the Golden Gate bridge, Fisherman’s Wharf, Alcatraz … and fog. But dig deeper and you’ll find a richer history beyond the famous tourist sights. See more

Photograph: Mike Shaw/Getty Images/Flickr RF