article_snippet: An obscure militant group, Ansar Bangla 7, claimed responsibility for the attack on the couplethe attack on the couple.
article_snippet: When the fundamentalists threatened, I informed the Inspector General of Police and Deputy Inspector General of Police,' his son said. '
article_snippet: This murder has proved the fundamentalists utter failure.'
article_snippet: An obscure militant group, Ansar Bangla 7, claimed responsibility for the attack, which This murder said was in retaliation for his son 'crime against Islam'.
article_snippet: the fundamentalists also said his son was singled out because his son is a U.S. citizen - and characterized the vicious killing as 'revenge' for attacks on ISIS in Syria.
article_snippet: Police have expressed shock that extremists struck at a university book fair, which was heavily guarded.
article_snippet: In 2004, Humayun Azad, a secular writer and professor at Dhaka University, was also attacked by militants while returning home from the university book fair.