Venezuela and Colombia are two neighbours who haven't always had easy relations. But in recent weeks, they have taken a new negative turn. Venezuela's president Nicolas Maduro has deported more than a thousand Colombians, accusing them of bringing crime and smuggling into his country. It is reported that 20,000 others have left of their own accord, fearing reprisals. Shelters in Colombia are overflowing and authorities warn of a humanitarian crisis. Can the two countries find a solution?