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January 12 - British submarine Truculent collides with a Swedish oil tanker in the Thames Estuary and sinks - 64 dead.

January 13 - Finland forms diplomatic relations to People's Republic of China.

January 15 - Volcanic cloud kills 5000 in Mount Lamington, New Guinea.

January 17 - The Great Brinks Robbery - 11 thieves steal more than $2 million from an armored car in Boston, Massachusetts.

January 21 - Alger Hiss is convicted of perjury.

January 23 - The Knesset passes a resolution that states Jerusalem is the capital of Israel.

January 24 - Cold War: Klaus Fuchs, a German émigré and physicist, walked into London's War Office and confessed to being a Soviet spy: for 7 years, he passed top secret data on U.S. and British nuclear weapons research to the Soviet Union;[1] formally charged February 2.

January 26 - India promulgates its constitution forming a republic and Rajendra Prasad is sworn in as its first president.

January 28 - Somaliland is put under Italian mandate

January 29 - Lord Balfour criticizes the fact that rationing is still in force in Britain.