British actor Tom Hiddleston has embarked on a trip to West Africa to witness how projects by the United Nations Children's Fund (Unicef) have helped locals.

The Avengers star travelled to Guinea this week (beg21Jan13) to visit communities which have been given a boost by the organisation.

Hiddleston met with youngsters at a school in the capital city of Conakry, and he took to his page to upload a photograph of his visit.

In an accompanying post, he writes, "Children at Tinafan, a Unicef-supported school for the circus arts in Conakry, who put on an incredible show."

The actor has promised to document his whole trip in posts on Twitter.