Worn down by near impossible cross-continental journeys, migrants trapped in a purgatory-like holding camp in Roszke, Hungary, finally breached the police line. They spilled and tumbled through, some breaking into a full sprint into nearby cornfields.

Amongst them was Syrian refugee Osama Abdul Mohsen, who was being chased by a policeman. As he struggled to run while holding his seven-year-old son, a Hungarian journalist put her camera down to stick out her leg out and trip him.

This jaw-dropping moment that went viral was the subject of one of the more memorable Reuters images this year. They also include the devastating terrorist attacks on Paris and a loose hippopotamus wandering the streets of Tbilisi, Georgia.

Here’s a look Reuters’s selection of some of their top images this year — and the photographers’ stories behind them. Their quotes have been edited for clarity and space.