Nigeria's president says 51 civilians have been killed in unrest following days of peaceful protests over police abuses, and he blames "hooliganism" for the violence while asserting that security forces have used "extreme restraint. The police order could further heighten tensions in Africa’s most populous country after its worst turmoil in years. Adamu, ordered colleagues to “dominate the public space” while announcing that enough is enough, a statement said. By not taking action against security forces, some Nigerians have warned, the president could inspire further abuses. We are part of the system, we are part of this governance.”___Bashir Adigun in Abuja, Nigeria contributed.