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Police at the scene of the shooting in Edmonton, north London. Photograph: John Stillwell/PA A 20-year-old man has been arrested on suspicion of the murder of a teenager shot dead in north London this week. Mohammed Hussein, 19, was found collapsed in Bounces Road, Edmonton, at 9.45pm on Monday. A postmortem examination found he died of a shotgun wound to the chest. Police said a 20-year-old man had been arrested on Wednesday on suspicion of murder and remained in custody at an east London police station. A spokesman said officers were keeping an open mind about the circumstances of the incident and any motive. After the shooting, neighbours ran to help and paramedics tried for half an hour to save Hussein before he was pronounced dead at the scene. Jordan Simbananiye, 18, said: "They spent about 20 or 30 minutes trying to resuscitate him but then after about half an hour they put a blanket over him."

Disputed role … Ben Affleck as CIA fixer Tony Mendez in Argo. Photograph: Allstar/Warner Bros/Sportsphoto It has caused anger in countries as far flung as Canada, Britain and Iran. Now Ben Affleck's Oscar-winning Argo must face up to a new challenge from diplomats in New Zealand who say they can prove that the Iran hostage crisis-set historical drama wrongly ignored their country's contribution to events shown in the film. Argo Production year: 2012 Country: USA Cert (UK): 15 Runtime: 120 mins Directors: Ben Affleck Cast: Alan Arkin, Ben Affleck, Bryan Cranston, Christopher Denham, Clea DuVall, John Goodman, Kerry Bishe, Rory Cochrane, Scoot McNairy, Tate Donovan, Victor Garber More on this film Chris Terrio's Oscar-winning screenplay for Argo depicts New Zealand's embassy as unwilling to help with an ambitious plan to fly six US diplomats out of the country. The film implies that CIA fixer Tony Mendez, played by Affleck, is the main mover and shaker in a largely US-pla

Not just music … Ono and her son Sean Lennon visit gas drilling sites earlier this year, for Artists Against Fracking. Photograph: Richard Drew/AP Patti Smith, Boy George, Siouxsie Sioux and Iggy and the Stooges will be among the performers at this year's Meltdown festival, curated by Yoko Ono. For a week and a half in June, London's Southbank Centre will host everything from Immortal Technique's hip-hop to the Pet Shop Boys' take on Battleship Potemkin. Yoko Ono's Meltdown festival Southbank Centre, London SE1 Starts 14 June Until 23 June Details "I'm not pursuing big names for the sake of big names," Ono said in November, when herMeltdown role was announced. "I'm thinking along the lines of a concept, which is more refreshing. There will definitely be an element of feminism and the plight of women … [and] I am thinking of having one or two events where I ask men to say something strong about themselves too." The festival's initial l

In this week's edition of Tech Weekly, Aleks Krotoski talks to author Tom Chatfield about his new book Netyemology, an exploration into the role of the internet in reshaping and accelerating the creation of words and forms of language. And never judge a laptop by its cover, as Google releases its high-spec Chromebook Pixel laptop, Jemima Kiss is joined by the Guardian's developer advocate Michael Brunton Spall to take a look under its bonnet and see if this slick rival to the Apple Powerbook is up for a fight. Also, we review this week's tech news including the demise of the external hard drive and why the UK is resisting a legal right to be forgotten online.

Mark Zuckerberg, Facebook's co-founder and chief executive made the announcement Menlo Park, California. Photograph: Robert Galbraith/Reuters Facebook launched its new Android "experience", Facebook Home, with a messaging feature called Chat Heads at its heart. When a user's Facebook friends start a new chat, their picture pops up on Android phone home page in a small bubble – a "chat head". "We think that Chat Heads are this great, personal way to do messaging," said Facebook CEO Mark Zuckerberg at the presentation in San Francisco, California. Adam Mosseri, Facebook product designer, said the feature would personalise people's phones better. "What we're trying to do is shift people's focus away from tasks and apps and toward people," he said, He demonstrated how the phone bounces back and forth between the various features. "There's nothing between you and your content. You can literally just reach out and tou

She's being touted as Hollywood's next big thing, so it's no surprise that Lily Collins has been stepping up her style game. The British actress looked on-trend and effortlessly cool in an black and white outfit as she landed in New York on Wednesday, gearing up to promote new film Mortal Instruments. Proving that she's no A-list diva just yet, the daughter of Phil Collins looked like she put together a stylish look made up of affordable high street pieces.   Pared-back chic: Lily Collins touched down at New York's JFK airport wearing a stylish black and white outfit on Wednesday The down-to-earth 24-year-old, whose career is set to skyrocket after the new Twilight-style film is released, embraced her natural beauty by going fresh-faced. Instead of succumbing to the LA stereotype, Lily was making her pale complexion and dark hair work for her, cultivating a slightly Gothic look. Making quite an impact, the Mirror Mirror actress accentuated her

Barack Obama will hand back 5% of his presidential salary of $400,000. Photograph: Brennan Linsley/AP Barack Obama will return 5% of his salary to the US treasury in a show of solidarity with federal workers affected by $85bn in government-wide spending cuts. Hundreds of thousands of workers could be forced to take unpaid leave if Congress fails to reach an agreement soon to undo the cuts, which came as punishment for the inability of the Obama administration and Congress to come up with another way to address the country's debt. The 5% that Obama will hand back mirrors the 5% cut that domestic agencies took when the reductions went into effect. The Pentagon's budget took an 8% hit. Every federal agency is grappling with spending cuts, which the White House has said could affect everything from commercial flights to classrooms. A 5% cut from the president's salary of $400,000 (£265,000) a year amounts to $20,000. "The salary for the president, as with members of Congre