Today in Pictures: Dec. 15

A Greek pensioner holds a banner during a demonstration against government pension reform policies in Athens, Greece, December 15, 2016.

Colo, a Western Gorilla, rests in her enclosure at the Columbus Zoo in Ohio. Colo, the very first born and oldest surviving gorilla in captivity, will celebrate her 60th birthday on Dec. 22.

Displaced Iraqi children, who fled the Islamic State stronghold of Mosul, look through a window in a tent in Khazer refugee camp, east of Mosul, Iraq.

Young residents from the Karatepe municipality camp for migrants and refugees sing and perform during a concert on the Greek island of Lesbos.

The event was organised by the ART initiative, whose members have been teaching music daily to more than 60 refugee children living in the camp for the past year. The children come from various countries like Syria, Eritrea, Congo, Afghanistan and Iraq.

Pope Francis bends to kiss a child participating in a public service for patients and employees of Rome's pediatric hospital, Bambino Gesu, held in the Paul VI hall at the Vatican.

A caravan of buses arrives in Aleppo for an evacuation operation of rebel fighters and their families from rebel-held neighborhoods in the embattled city.

A convoy of ambulances and buses left rebel territory in Aleppo in the first evacuations under a deal for opposition fighters to leave the city after years of fighting. The rebel withdrawal will pave the way for President Bashar al-Assad's forces to reclaim complete control of Syria's second city, handing the regime its biggest victory in more than five years of civil war.

Orange fruit cover the ground of a plantation near the West Bank city of Nablus. After the region was recently hit by strong rainfalls and heavy storms, many trees lost their fruit in the harsh weather conditions.

Doug Heer inspects an ice-encrusted tree along Barber Drive in Eugene, Oregon before cutting it back to make way for oncoming traffic. An ice storm in the Willamette Valley caused the downing of hundreds of trees and loss of power to residents in the region.

People dressed as Stormtroopers from the Star Wars film franchise pose on the Millennium Bridge to promote the latest release in the series, "Rogue One", in London, England.

People skate during the opening of an ice rink on the roof of the skyscraper OKO, a tower in the Moscow International Business Center.