Ten Things You Need to Know Today: Friday 20 Jul 2012

A masked gunmen has shot dead at least 12 people and wounded up to 50 others at a screening of the new Batman movie, The Dark Knight Rises, at a cinema in Denver, Colorado. The shooter reportedly detonated a smoke or tear gas canister before opening fire into the audience at a midnight showing of the film at the Century Aurora 16 Movie Theatre. A 24-year-old suspect has been arrested and named as James Holmes.

Newsreader Alastair Burnet has died at the age of 84. The broadcaster presented the first ever edition of the ITN News at Ten in 1967 and fronted his last bulletin in 1991. He also presented ITV's coverage of elections and royal weddings in the 1970s and 80s. Burnet also had a successful career in print media and was editor of The Econimst for nine years.

UK border staff will strike just before the Olympics, despite fury from critics who say July 26 will be the eve of one of the busiest days in the history of Heathrow as people arrive for the Games. Theresa May said the action was "shameful" and senior Tory MPs said the country was being "held to ransom".

The Home Office says it is satisfied that security for the London 2012 games has not been compromised by the failure of security firm G4S to provide enough staff and the necessity to draft in 3,500 soldiers instead. It has emerged that a further 1,200 troops have been put on standby to assist if needed.

The Daily Mail reports the women of Britain's first-ever beach volleyball Olympic side have vowed to keep wearing bikinis, even though they are fed up with the attention the revealing outfits garner. Players have been given the option of wearing a long-sleeve top and a pair of shorts but find them constricting.