An online group that calls itself the Islamic State's "Hacking Division" has published profiles of 100 U.S. service members, including their names, photos and purported home addresses, encouraging its "brothers residing in America" to kill those named on the list.

Cash-strapped Americans anxious for tax refunds are increasingly turning to payment advances, prepaid cards or other costly services when getting tax preparation help, according to new federal data raising concerns among regulators about whether consumers are fully informed about the…