article_snippet.sent: A series of brutal attacks on civilian buses have baffled investigators in the past month.
article_snippet.sent: Another hit three buses traveling in Wardak, central Afghanistan, killing 13 civilians including women and children.
article_snippet.sent: Khalil Andrabi, the police chief of Wardak told CNN of the bus attack: "I can't hundred percent say that Khalil Andrabi, the police chief of Wardak were IS, but Khalil Andrabi, the police chief of Wardak act was completely similar to what IS is doing in Syria (and) Iraq.