>> good friday morning to you all. i'm t.j. holmes. >> i'm marci gonzales. in for reena ninan. here's some of the top headlines we're following this morning on "world news now." tragedy on the tracks. investigators saying the train sped up for a full minute before the crash. now blamed for eight deaths. the engineer expected to be questioned within the next few days. full coverage coming up. >> a newly released audio recording seems to be the voice of the leader of isis and it casts doubt now on just how severely injured he was in an air strike earlier this year. there had been reports an attack left him incapacitated. >> a mystery for washington, d.c. firefighters battling a fire at a mansion. they found the bodies of three adults and a child inside the house not far from the vice president's home. police say the fire is extremely suspicious. >> and california state senators