An October fright: global stocks see red and the Dow wipes out all of its third-quarter gains on the opening day of Q4 after U.S. manufacturing activity hits a decade-low. In the U.K., Prime Minister Boris Johnson is set to reveal his final Brexit ultimatum to the European Union, ruling out asking for any extension should Brussels turn down his offer. Hong Kong experiences further unrest overnight following the police shooting of a teenaged pro-democracy demonstrator. The violence is some of the worst the Special Administrative Region has seen since anti-Beijing protests erupted 17 weeks ago. And in Silicon Valley, Facebook founder Mark Zuckerberg has panned Democratic presidential hopeful Elizabeth Warren’s plans to break up large tech companies should she reach the White House, saying that he fancies his chances in any subsequent legal battle.

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