DHAKA, Bangladesh (AP) — Bangladesh's government on Sunday played down a statement by the Islamic State group that it was responsible for gunning down a Japanese man in the South Asian country, saying it would investigate the "fishy" claim.Masked assailants riding a motorbike shot and killed Kunio Hoshi in northern Bangladesh on Saturday, becoming the second foreigner in a week to be fatally shot in the country.The Islamic State group issued a statement claiming responsibility for the attack, according to the SITE Intelligence Group, which monitors jihadi postings online.