NEW : Terrorists armed with grenades , bombs , official says . NEW : The FBI is investigating the possibility of a terrorist attack on U.S. soil in response to the video posted online by ISIS last week showing an American journalist being beheaded. By Saturday evening the death toll from the attacks reached at least 183 , federal officials said . Officials link boat floating off Mumbai to attacks ; calls placed to Pakistan . At least 183 killed during attacks , according to federal officials .
NEW : Terrorists armed with grenades , bombs , official says . NEW : The FBI is investigating the possibility of a terrorist attack on U.S. soil in response to the video posted online by ISIS last week showing an American journalist being beheaded. Officials link boat floating off Mumbai to attacks ; calls placed to Pakistan . At least 183 killed during attacks , according to federal officials .