Around 50 people were killed in a bomb blast at a busy meat market in the northeastern city of Maiduguri in Nigeria on Tuesday.

The bomb went off at around 1 pm local time, killing shoppers and passersby. There was no immediate claim of responsibility for the attack, which followed two weekend bombings that killed at least 30 people and appeared to be the handiwork of Boko Haram.

Meanwhile, a video purporting to show Boko Haram militants and featuring an unidentified hooded speaker was posted on social media websites on Tuesday.

The speaker accused Nigeria and three adjacent states that have combined to fight the Islamist militants – Niger, Chad and Cameroon – of lying about recent military successes that they said had pushed the militants back into a rural pocket.