MAIDUGURI, Nigeria — With a malevolent laugh, the leader of Nigeria’s Islamic extremists tells the world that more than 200 kidnapped schoolgirls have all been converted to Islam and married off, dashing hopes for their freedom. “If you knew the state your daughters are in today, it might lead some of you … to die from grief,” Abubakar Shekau sneers, addressing the parents of the girls and young women kidnapped from a remote boarding school more than six months ago. In a new video released late Friday night, the Boko Haram leader also denies there is a cease-fire with the Nigerian government and threatens to kill an unidentified German hostage.“Don’t you know we are still holding your German hostage (who is) always crying,” he taunts. “If we want, we will hack him or slaughter him or shoot him.”A German development worker was kidnapped at gunpoint in Gombi, a town in Nigeria’s northeast Gombi in July. Police reported he was ambushed as he drove to work.