Xinhua world news summary at 0030 GMT, Dec. 19

An accident occurred in a gold mine in the eastern part of Democratic Republic of the Congo, killing at least 20, a local official said on Sunday. (DR Congo-Mine Accident, Urgemt)

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LONDON -- The leaders of Britain's biggest trade union and business organization sent a joint letter on Sunday to British Prime Minister Theresa May, calling for a unilateral move to agree EU migrants' stay in the country after Brexit.

In the open letter signed by union chief Frances O'Grady of the Trade Union Congress and Adam Marshall, the director general of the British Chambers of Commerce, the two leaders called on May to end the uncertainty for businesses and millions of workers by confirming that the government will give current EU migrants a right to stay in Britain after Brexit. (Britain-EU-Brexit)

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HOUSTON -- On Aug. 1, 1966, a graduate student climbed the 27-story tower at the University of Texas at Austin and opened fire with an arsenal of weapons, killing 15 people and wounding 31 before police killed him.

Architectural student and ex-Marine Charles Whitman used three rifles, two pistols and a sawed-off shotgun to gun down innocent victims in what was the first school mass shooting in U.S. history. (US-Houston-School shootings, Feature)

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AMMAN -- Gunmen on Sunday killed four policemen and a female Canadian tourist in southern Jordan, the general security department said.

The gunmen, who were hiding inside Al Karak Castle, a famous tourism attraction in Karak city, opened fire at a police unit near the site, killing four policemen and a Canadian female tourist, the police said. (Jordan-Gunmen) Endi