article_snippet.sent: We've come to this particular Islamic religious school because the man suspected by Kenyan authorities of being the "mastermind" behind the atrocity -- Mohamed Mohamud -- once taught here.
article_snippet.sent: He was someone who was very quiet, He didn't like too much talk," recalls Sheikh Khalif Abdi Hussein, the principal at Madrassa.
article_snippet.sent: He says He also taught with Mohamud for two years.
article_snippet.sent: When He left Madrassa, He joined Al-Shabaab.
article_snippet.sent: Meanwhile, Sheikh Khalif insists Sheikh Khalif Madrassa has nothing to do with Mohamud's extreme, violent ideas.
article_snippet.sent: Sheikh Khalif is a dangerous man, a killer, a criminal," Sheikh Khalif says.
article_snippet.sent: But Sheikh Khalif was also once a neighbor.
highlights_snippet.sent: Mohamed Mohamud taught at a Madrassa in the Kenyan town .
  