Supporters Pays Respects to Steven Sotloff

Supporters of Steven Sotloff place candles at the Reflection Pool as they take part in a candle light vigil at the University of Central Florida, in Orlando, Florida, Sept. 3, 2014.

Students Nada Hassanein (left) and Hiba Shaban, members of the Orlando chapter of the Syrian American Council, attend a vigil honoring U.S. journalist Steven Sotloff at the Reflection Pool on the campus of the University of Central Florida, in Orlando, Florida, Sept. 3, 2014.

Chris Nault, who says he is a former rugby teammate of U.S. journalist Steven Sotloff, speaks with reporters during a vigil for Sotloff at the Reflection Pool on the campus of the University of Central Florida in Orlando, Florida, Sept. 3, 2014.

Rabbi Chaim Lipskier makes remarks to students and supporters taking part in a candle light vigil to honor Steven Sotloff, at the University of Central Florida, in Orlando, Florida, Sept. 3, 2014.

Vice President Joe Biden speaks about the killing of Steven Sotloff while visiting the Portsmouth Naval Shipyard in Kittery, Maine, Sept. 3, 2014.

During a press conference, President Barack Obama says that the U.S. plans to fight the Islamic State until it is no longer a force in the Middle East, in Tallinn, Estonia, Sept. 3, 2014.

President Barack Obama at a news conference with Estonian President Toomas Hendrik, wherein Obama commented about U.S. journalist Steven Sotloff, killed by Islamic State militants, Tallinn, Estonia, Sept. 3, 2014.

Television journalists stand outside the family home of journalist Steven Sotloff, in Pinecrest, Florida, Sept. 2, 2014.

This still image grabbed from an undated video released by Islamic State militants on Aug. 19, 2014, purports to show journalist Steven Sotloff being held by the militant group.

Arthur Sotloff, father of slain journalist Steven Sotloff, leaves the family home in Pinecrest, Florida, Sept. 2, 2014.