Riot police detain a demonstrator during a protest against fare hikes for city buses in Sao Paulo, Brazil January 22, 2019.

Tennis - Australian Open - Quarter-final - Melbourne Park, Melbourne, Australia, January 23, 2019. Serbia's Novak Djokovic signs autographs after Japan's Kei Nishikori retired the match.

Relatives and friends carry the coffin of Aiia Maasarwe, 21, an Israeli student killed in Melbourne, during her funeral in her home town of Baqa Al-Gharbiyye, northern Israel January 23, 2019.

A frost covered Wendelstein church, Germany's highest church, on the 1838 metres (6030 feet) high Wendelstein mountain is seen near Bayrischzell, Germany, January 23 , 2019.

A villager escorts horses as they bathe in a natural hot spring at a snow-covered valley in the eastern Bitlis province, Turkey January 22, 2019. Picture taken January 22, 2019.

Tennis - Australian Open - Quarter-final - Melbourne Park, Melbourne, Australia, January 23, 2019. Serena Williams of the U.S. reacts during match against Czech Republic's Karolina Pliskova. REUTERS/Kim Kyung-Hoon

Former British Foreign Secretary Boris Johnson arrives at Downing Street in London, Britain, January 23, 2019.

Paraplegic migrant Jose Serrano, from Honduras, rests beside his friend Jerian, during their journey towards the United States, in Niltepec, Mexico, January 22, 2019.

Elton John performs during his "Farewell Yellow Brick Road" final tour at the Staples Center in Los Angeles, California, U.S. January 22, 2019.

A hawker carries mannequins past graffiti in Mbare township, Harare, Zimbabwe, January 23, 2019.

The China National Acrobatic Troupe performs during the gala of the 43rd Monte-Carlo International Circus Festival in Monaco, January 22, 2019

A woman tries to catch snowflakes with her tongue during a snowfall on Chandragiri Hills in Kathmandu, Nepal January 23, 2019.

A trader works on the floor of the New York Stock Exchange (NYSE) in New York, U.S., January 22, 2019.

Models take pictures during a rehearsal before the Haute Couture Spring-Summer 2019 collection show by designer Franck Sorbier in Paris, France, January 23, 2019.

A leaflet on a table inside the Apollo Pizzeria, in London, Britain, January 22, 2019.

Opposition supporters take part in a rally against Venezuelan President Nicolas Maduro's government and to commemorate the 61st anniversary of the end of the dictatorship of Marcos Perez Jimenez in Caracas, Venezuela January 23, 2019.