Accra - Unknown gunmen shot and killed a Ghanaian investigative journalist who helped to expose a massive corruption scandal in the country's national football leagues, a family member said Thursday.

Ahmed Hussein-Suale was killed while driving his car near his home in the Madina neighbourhood of the capital Accra on Wednesday evening, cousin Musa Mohammed told dpa.

"A few minutes after he left the house, we heard gunshots and when we rushed out, we saw him in his car. He was shot twice in the chest and [once] in the neck," Mohammed said.

"We are very devastated as a family. He was a journalist who was just doing his work to expose corrupt people," the cousin added. 

Hussein-Suale belonged to Tiger Eye Private Investigations, a team led by award-winning journalist Anas Aremeyaw Anas, whose reporting led to the banning of various football referees and officials, including the president of the Ghana Football Association, last year.

Security agencies said they launched an investigation into the killing.