Mexican drug lord Joaquín "El Chapo" Guzmán may be in hiding in Costa Rica, after the fugitive's son appeared to reveal his location on Twitter by accident.

Jesus Alfredo Guzman Salazar tweeted a photo of himself and his father eating at a restaurant, but seemed to forget about Twitter’s location function which automatically tags where an image is taken.

The image shows Salazar eating at a table with two other men who have their faces obscured by cartoon emoticons; however the figure on Salazar’s left bears a strong resemblance to the infamous drug lord.

The tweet which clearly shows the location has been retweeted and favourited nearly 1,500 times.

Costa Rica’s Judicial Police have announced that they are investigating the Twitter post, according to local media.

However, the post remains the first piece of evidence to suggest that Guzman is in the country.

Guzman, who has appeared on the US’s most wanted list, was the leader of the Sinaloa cartel which is known for smuggling large amounts of illegal drugs into the US.

Considered to be the world’s wealthiest and most powerful drug trafficker, Guzman escaped from Mexico’s Altiplano prison in July by digging an elaborate mile long tunnel with ventilation and lighting.