Extremist Islamists may well have wondered how they could possibly celebrate the happiest day of their lives – their wedding – while at the same time re-affirming their commitment to violent jihad.

Or they may not have. In any case, the gap in the market has now been filled by the Islamic State, which is offering honeymoon bus tours across its self-declared caliphate spanning Iraq and Syria.

The move into tourism comes after the group, formerly known as the Islamic State of Iraq and Syria, or ISIS, opened a marriage bureau for women who want to meet the jihadi of their dreams.

The matchmaking service is operating from Al-Bab, in Syria’s Aleppo province, for ‘single women and widows who would like to marry IS fighters,’ said the Syrian Observatory for Human Rights.

Newlywed couples can then join other civilians on Islamic State’s bus tours around the various parts of the newly declared Muslim theocracy.

Running twice a week from Raqa in Syria to Anbar, Iraq, IS buses fly the group’s distinctive black flag and play jihadist songs throughout the journey, reports AFP.

It is not known whether tourists are invited to sing along.

Islamic State now controls massive swathes of northern and eastern Syria, the Iraq-Syria border, and parts of northern and western Iraq.