At least 30 people have been killed after unidentified gunmen opened fire on the people at a village in Nigeria, the police said.Mohammed Shehu, a police spokesman said the incident took place on Tuesday in the Kware village of Shinkafi district.The gunmen also burned the villagers' homes, Xinhua news agency reported.According to local residents, hundreds of motorcycle-borne gunmen had stormed the village.They, however, claimed that at least 35 people were killed in the attack following which many villagers fled for safety.Zamfara and Kaduna in Nigeria's northwest region, have witnessed a series of onslaughts by the gunmen in recent months.