Today's front pages: Paris, Corbyn, Brexit and Diet Coke make a splash

Many newspapers lead today with last night's attack in Paris, during which a policeman died and two more were injured when a "Kalashnikov-wielding attacker" opened fire on a police bus.

The Daily Telegraph focuses on the news that the gunman "was known to security services".

It is joined on Metro's front page with a story about health warnings for low-calorie fizzy drinks.

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The Daily Express also leads with the health story, adding that the observational study "cannot be scientifically explained".

Brexit makes the front page at The Guardian, which reports that the chief of the European Parliament has said the UK would be welcomed back to the bloc should it change its mind over leaving.

Sticking with the theme, The Times reveals that no deal will be made with the bloc unless Theresa May "accepts rules on European workers and security", according to leaked negotiating guidelines from the European Parliament.

Labour leader Jeremy Corbyn's decree that there will be no second referendum on the EU in Labour's manifesto makes the front page of the i newspaper.

The Daily Mirror leads on the news of an "NHS scandal" involving the deaths of 15 children and three mothers.

Meanwhile, The Sun has an "exclusive video" featuring former England footballer Adam Johnson, who was jailed for grooming and sexual activity with a 15-year-old girl, in "vile prison rants about his victim".

In business news, Donald Trump's decision to launch a national security probe into the steel industry has set the stage for a global showdown with China, says the Financial Times.