article_snippet: A team of five investigators went "through the apartment looking for clues as to what the co-pilot's motivation might have been, if the co-pilot did indeed bring the plane down," police spokesman Markus Niesczery said.
article_snippet: And the French government has asked the FBI to help investigate the crash, a law enforcement official said.
article_snippet: Investigators so far say Investigators're baffled about why Lubitz would have crashed the plane .
highlights_snippet: the co-pilot"
  Investigators say "
  Investigators're baffled as to why .