Kidnappers in Nigeria have killed at least 38 people they abducted from a village in northern Zamfara state despite ransoms being paid for their release, a local official told the BBC.

In recent years, criminal gangs in the region, known in the country as bandits, have taken to kidnapping people as a means to raise money.

In this incident, 56 people were taken from Banga village, Kauran Namoda local government area in March. The gunmen then demanded a ransom of one million naira ($655; £485) per captive, media in Nigeria report.

Local government chairman Manniru Haidara Kaura said that most of those killed were young people who "were slaughtered like rams".

"What happened was that the bandits demanded ransom money, and after some back-and-forth, they were given what they asked for. They then released 18 people, including 17 women and one young boy, on Saturday," Haidara added.