Police in Ghana say they're following numerous significant leads as they investigate the murder last week of a journalist who exposed widespread corruption in football.

In a statement, police said they had interviewed an MP, Kennedy Agyapong, and the former head of the Ghanaian Football Assocation, Kwesi Nyantakyi.

The killing of Ahmed Hussein-Suale by unidentified gunmen in a suburb of the capital, Accra, last Wednesday caused shock in Ghana.

He was part of an investigative team whose work last year prompted the dismissal or banning from football of dozens of referees and other officials.

BBC Africa Eye made a documentary about the scandal last year after gaining access to the investigation led by journalist Anas Aremeyaw Anas, who runs Tiger Eye.