A man adjusts plastic strings, used to produce mats, inside a mat factory in the rebel-controlled area of Maarshureen town in Idlib province, Syria.

A woman (3rd L), who is a relative of several missing people, cries at the site of a landslide that hit an industrial park in Shenzhen, Guangdong province, China. More than 70 people are still missing.

Expedition 46 Flight Engineer Tim Kopra spacewalks with Expedition 46 Commander Scott Kelly (not shown) to successfully move the International Space Station's mobile transporter rail car ahead of the docking of a Russian cargo supply spacecraft, Dec. 21, 2015.

Shi'ite rebels, known as Houthis, stand around a large banner with Arabic writing that reads,"Muhammed" during the celebration of Moulid Al-Nabi, the birth of Islam's Prophet Muhammad in Sana'a, Yemen.

Skiers and snowboarders ride a lift up a mountain at Snoqualmie Pass, Washington, USA. A weather pattern that could be associated with El Nino has turned winter upside-down across the U.S. during a week of heavy holiday travel, bringing spring-like warmth to the Northeast, a risk of tornadoes in the South and so much snow in parts of the West that there are concerns about avalanches.

A group of school children walk along the street waering face masks in Sarajevo, Bosnia. Because of high pollution mixed with fog, Sarajevo authorities say they closed down schools in the city while volunteers began distributing face masks to those who still decided to get out of the house despite experts' warnings.

Seagulls glide over the water's surface on a foggy day at the Idroscalo artificial lake in Milan, Italy.

Indian Christians pay their respects at the illuminated St. Mary's Catholic Church in Amritsar, India.

Fresh snowfall blankets Elmadag district, near the Turkish capital Ankara.