ABUJA (Reuters) - “Hoodlums” wearing military uniforms may have shot Nigerian protesters campaigning against police brutality and it was too soon to tell if soldiers were involved, the country’s attorney general said on Monday.Demonstrations across the country turned violent on Oct. 20 when witnesses in Lagos said the military opened fire on peaceful protesters in the upmarket Lekki district shortly after local authorities imposed a 24-hour curfew, drawing international condemnation. Soldiers and police killed at least 12 people in two Lagos neighbourhoods on Oct. 20, according to witnesses and rights group Amnesty International. The army and police have denied involvement. Attorney General Abubakar Malami told reporters in the capital, Abuja, the matter was being investigated and there was a need to establish whether the shooting took place, who was responsible and whether the people who were shooting were part of the military.