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Anderson also said there remained some unanswered questions about the deal, such as whether customers would face data transfer fees for moving large amounts of information back and forth between services.

Andy Tsang Wai-hung, Hong Kong's former police chief, said the city "urgently" needs a national security law to take on the city's violence, which he said is verging on "terrorism in nature".

Andrew Cohen and William Hennelly in New York and Reuters contributed to this story.

An usher confronted the shooter, who apparently shot himself in the struggle before he was arrested, police said.

And if you prefer the URL-based login method, don’t worry, it’s not going away.