http://www.bbc.co.uk/news/world-africa-17908704

While the Sunni Islamist group Boko Haram makes headlines in Nigeria, a Shia group is also causing anxiety in some quarters, the BBC's Mark Lobel reports from the city of Kaduna.

Saharan sand swirls around us as horses gallop through the film set we are visiting.

Brightly painted walls and wooden and straw weaponry line old forts, recreated to mirror the scene of the brazen Islamic revolution that arrived here in the 19th Century.

I am seeing for myself how media-savvy the mainly-Shia Islamic Movement in Nigeria has become.

Inside the compound, a dubbing operation is under way.

Flattering documentaries of religious leaders are being translated into the local Hausa language, with hundreds of DVDs sold to eager locals every month.

The movement has had a thriving daily newspaper for more than two decades and says it will soon broadcast its internet-based Hausa radio station on the country's main air waves, and start up a new TV channel.

Sheikh Zakzaky was a political prisoner for nine years during the 1980s and 1990s, accused by successive military regimes of civil disobedience.

His supporters have been involved in many violent clashes with the state over the decades - 120 of his followers are currently in prison - and political analyst Muhammad Kabir Isa says they do constitute a genuine threat.
Mr Isa also alleged the movement's supporters have now become a lot more influential in society.

"I know for example he is making sure his members are recruited into the army, his members are recruited in the police force, he has people working for him in the state security service," he said.

In recent years, the once tiny movement's membership has sky-rocketed in size and scope while all attention has shifted to Boko Haram, the Sunni Islamist group fighting for an Islamic state in Nigeria.

I knew this would happen. Expect more.