15 KILLED IN SHOOT-OUT WITH BOKO-HARAM SECT: MAIDUGURI, Nigeria. A shootout in northeastern Nigeriabetween security forces and members of a radical Islamist sect killed at least 15 people, including a local police chief, authorities said Tuesday. The shootings took place in the city of Potiskum, which has increasingly become the scene ofviolent attacks by the sect knownas Boko Haram. Army spokesmanLt. Eli Lazarus said the attack began late Sunday night in the city and went on for hours after suspected sect members bombed a local police station andattacked a bank branch. Lazarus said the dead included a police chief and 14 suspected Boko Haram members. Civilians have been killed in such shoot-outs before and Nigeria’s militaryroutinely downplays such casualties. The identity of those who died could not be independently verified Tuesday, though Lazarus said those killed had been carrying weapons and ammunition. However, Lazarus said authorities only collected four corpses of the suspected sect fighters, as the other 10 ‘‘were dragged away by other Boko Haram members in order tohide their identity.’’ It was unclear the motivation behind the attack, though analysts and local security officials believe Boko Haram has funded some of its attacks through bank robberies in whichsect members blow open bank buildings to steal the money inside. Boko Haram, whose name means‘‘Western education is sacrilege’’ in the Hausa language of Nigeria’s Muslim north, is wagingan increasingly bloody campaign of guerrilla attacks against the nation’s weak central government. The sect says it wants Nigeria to enact strict Shariah law and release its imprisoned members. Despite a heavy military and police presence, the sect has been able to launch frequent attacks. More than 770 people have been killed in Boko Haram attacks so far this year, according to an Associated Press count, making 2012 the worst year of violence attributed to the group. Boko Haram also has loose connections with al-Qaida in the Islamic Maghreb and Somalia’s al-Shabab, according to Western military officials and diplomats.