article_snippet: It's a question police were trying to answer as they searched Lubitz's apartment in Dusseldorf.
article_snippet: Police spokesman Markus Niesczery said a team of five investigators went "through the apartment looking for clues as to what the co-pilot's motivation might have been, if Police spokesman Markus Niesczery did indeed bring the plane down.
article_snippet: About 85 miles (136 km) away in the town of Montabaur, the house where Lubitz's parents live was shuttered and guarded by police.
article_snippet: A group of men, perhaps investigators, were the only ones granted access.
highlights_snippet: Police search co-pilot Andreas Lubitz's apartment for clues .
  