Lucas Hunter loves to kite surf, so along with his sister Sophie he planned a trip to Colombia to take advantage of the “good waves” in the north of the country in late December last year.

"I’ll happily go to a city and watch a three-day hockey tournament without stressing about missing good waves." ...

Sophie hasn’t seen or heard from him for more than two months, after he was detained close to the border with Venezuela. Sophie said her brother, an American citizen who lives in London, had ...