JOHANNESBURG (Reuters) - South African police fired tear gas in clashes with students at the University of KwaZulu-Natal on Thursday and arsonists torched a building at another campus overnight as protests over tuition costs spread.

(Reuters) - UnitedHealth Group , the largest U.S. health insurer, will stop covering several brand-name drugs as of next year, reinforcing a trend of payers steering prescriptions to lower-priced options.

LONDON (Reuters) - A new drug to treat a rare inherited bone disorder that was developed by Alexion Pharmaceuticals and could cost up to 1.5 million pounds ($2 million) a year per patient has been cleared for limited use by Britain's health cost watchdog.

BELGRADE, Sept 22 (Reuters) - Serbia has arrested 16 people suspected of trafficking refugees from the Middle East, Asia and Africa, as part of increased efforts to stem the flow of illegal migrants trying to reach Western Europe, the interior ministry said on Thursday.

LONDON (Reuters) - The University of Oxford, the oldest university in the English-speaking world and feeder for the British elite, has topped a global education ranking for the first time, but its vice-chancellor warned that Brexit could damage its long-term prospects.

WASHINGTON (Reuters) - The leaders of hundreds of Native American tribes will meet with President Barack Obama at his eighth and final Tribal Nations Conference at the White House next week, while thousands of activists are encamped on the North Dakota prairie protesting a $3.7 billion oil pipeline.

BERLIN (Reuters) - German e-commerce investor Rocket Internet reported progress on Thursday in cutting losses at its main start-ups with three set to generate profits by the end of 2017, while its shares were lifted by a plan to buy back convertible bonds.

VIENNA (Reuters) - A King penguin chick, hatched in Vienna's Schoenbrunn Zoo four weeks ago, has emerged from the folds of a protective parent's body.

MELBOURNE (Reuters) - India's Suzlon Energy Ltd is seeking Australian partners to develop local wind farms as it taps a surge in global investor appetite for green energy assets after the Paris climate agreement, its managing director said on Wednesday.