Jos (Nigeria): At least three people were killed in the central Nigerian city of Jos in an explosion targeting football fans watching the European Champions League final, the authorities said.

Saturday's blast came just days after a twin car bomb attack ripped through a crowded market in the city, killing 118 and raising fears of a spread of Boko Haram Islamist violence from the restive northeast.

"So far, we have three dead, three injured," Chris Olakpe, the commissioner of police for Plateau state, of which Jos is the capital, told AFP.

"The target was the (football) viewing centre." Olakpe said it was too early to say who may have been responsible for the blast, which came with people on edge and nerves frayed about a fresh strike.

The police chief also declined to comment on reports that the explosion was a suicide bombing but revealed that the bomber's improvised explosive device went off prematurely.