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A suicide bomber blew himself up in a banqueting hall where Islamic religious scholars had gathered in the Afghan capital Kabul on Tuesday, killing more than 50 people, three government officials said.

Two of the Kremlin's most prominent critics joined forces on Tuesday to try to stop a Russian becoming the next president of international police organization Interpol, saying they feared Moscow would abuse the post to hunt down its detractors.

Amazon.com Inc and private equity firm Blackstone Group are bidding for Walt Disney Co's 22 regional sports networks, including New York-focused Yes Network, CNBC reported on Tuesday, citing sources familiar with the matter.

Companies began triggering plans to keep operating if Britain leaves the European Union without an agreement, a "no deal" scenario the Bank of England said could plunge the economy into a crisis not seen since the 1970s.

Oil prices tumbled about 7 percent on Tuesday, with U.S. crude plunging to its lowest level in more than a year, caught in a broader Wall Street selloff that was fed by rising concerns about slowing global economic growth.

Switzerland votes this Sunday on an issue of national importance that has divided the Alpine country - whether to subsidize farmers who let their cows' and goats' horns grow naturally.