article_snippet.sent: 1990, when two men posing as police officers arrived at the . museum's front door.
article_snippet.sent: The guards on duty let
article_snippet.sent: The guards on duty in and the pair .
article_snippet.sent: allegedly overpowered The guards on duty, one of whom spoke earlier this year about his guilt of letting when two men posing as police officers arrived at the . museum's front door in.
article_snippet.sent: The next morning The guards on duty were found duct-taped to chairs .