Rwandan police have dismissed a rights report accusing the state of forced disappearances, saying there were "no missing" people but that they had arrested dozens as part of anti-terrorism operations.

The U.S.-based Human Rights Watch said Friday it had documented an increasing number of people who have been forcibly disappeared or have been reported missing since March.

A grenade attack at a Kigali market claimed a second victim Saturday as Rwanda prepared for legislative polls predicted to bolster the ruling party of President Paul Kagame.

Two grenades were used in an attack at a market on Friday that had killed one person and left 14 wounded. One of the devices had failed to explode and remained undetected.