The president of Libya's Olympic Committee has been set free, one week after gunmen grabbed him from his car in the capital, Tripoli.

Ahmad Nabil al-Alam was released Sunday and returned home. Libyan officials said it was not clear who kidnapped him, why he was released or where he was held.

The Libyan Olympic delegation is set to compete in judo, swimming, track-and-field and weightlifting. The Olympics begin Friday in London.