The FBI is to question the gunman's companion Marilou Danley who has returned to the US from the Philippines.
The US is slowly coming to terms with the deadliest mass shooting in its modern history.
At least 58 people are now confirmed dead and another 515
Bosnia and Herzegovina
The massacre, which occured during the Bosnian War, saw as many as 8,000 Muslims murdered at the hands of Bosnian Serbs.