A Briton is in custody in Morocco on charges related with the May 16 bombings in Casablanca that killed 44 people.

Moroccan authorities are also holding a second Briton, but the Foreign Office has refused to confirm if he is a terror suspect.

The British man was arrested in the northern city of Fes and is married to a Moroccan woman, according to reports.

The Foreign Office intervened after relatives of the two feared they had gone missing.

The Foreign Office said it would press for an explanation on why the UK national had been held for six weeks without the British authorities being informed.

Five bombs targeting a Spanish restaurant, the Belgian consulate, a Jewish community centre, a cemetery and a hotel killed 44 Western and Jewish tourists, including 12 suicide bombers.

Over 1,000 people were arrested following the attacks. 700 of them have been charged with direct or indirect involvement in the bombings. Trials are already under way.

The bombings have been blamed on the Islamist movement, the Salafist Jihad as well as Osama Bin Laden’s al-Qaeda network.