Members of the Louisville Islamic Center write messages on a memorial banner as they pay their respect to Muhammad Ali, the former world heavyweight boxing champion after he died at the age of 74 on Friday at the Islamic Center in Louisville, Kentucky, U.S. June 5, 2016. REUTERS/John Sommers II - RTSG51G

A red bike hangs as a memorial over the entrance to the old Columbia Auditorium, now Spalding University, where Muhammad Ali's red bike was stolen at age 12 and lead to him meeting Louisville Police Officer Joe Martin and learning to box at Martin's gym in Louisville, Kentucky, U.S. June 6, 2016. REUTERS/John Sommers II - RTSG92J

A man wears a t-shirt with a photo of Muhammad Ali during a tribute to the late boxing legend Muhammad Ali in Harlem, New York, U.S., June 4, 2016. REUTERS/Stephanie Keith - RTSG1QC

Todd Fortwengler (C) and his sons pay their respect to Muhammad Ali, the former world heavyweight boxing champion after he died at the age of 74 on Friday at the Ali Center in Louisville, Kentucky, U.S. June 4, 2016. REUTERS/John Sommers II - RTSG15U

Michael Cowden, a long time friend of the Champ shows off pictures from their high school year book as he pays his respect to Muhammad Ali, the former world heavyweight boxing champion after he died at the age of 74 on Friday at Ali Center in Louisville, Kentucky, U.S. June 5, 2016. REUTERS/John Sommers II - RTSG4QS

Mona Aner, a member of the Louisville Islamic Center takes a picture of her message on the memorial banner to Muhammad Ali, the former world heavyweight boxing champion after he died at the age of 74 on Friday at the Islamic Center in Louisville, Kentucky, U.S. June 5, 2016. REUTERS/John Sommers II - RTSG50L

Members of the Louisville Islamic Center pray together before an inter-faith service to honor Muhammad Ali, the former world heavyweight boxing champion after he died at the age of 74 on Friday at the Islamic Center in Louisville, Kentucky, U.S. June 5, 2016. REUTERS/John Sommers II - RTSG522

Russell David looks over all the flowers and mementos as he pays his respect to Muhammad Ali, the former world heavyweight boxing champion after he died at the age of 74 on Friday at Ali Center in Louisville, Kentucky, U.S. June 6, 2016. REUTERS/John Sommers II - RTSG92M

Boxing fans pay their respect to Muhammad Ali, the former world heavyweight boxing champion after he died at the age of 74 on Friday at Ali's childhood home in Louisville, Kentucky, U.S. June 4, 2016. REUTERS/John Sommers II - RTSG12Z

Franciscan Friars of the Renewal (L) from New York talk with long time friend of Muhammad Ali, Sonny Fishback (R), as they pay their respect to Ali, the former world heavyweight boxing champion after he died at the age of 74 on Friday at Ali's childhood home in Louisville, Kentucky, U.S. June 5, 2016. REUTERS/John Sommers II - RTSG4OX

Fans of Muhammad Ali, the former world heavyweight boxing champion looks over flowers, pictures and personal mementos as they pay their respects at the Ali Center in Louisville, Kentucky, U.S. June 6, 2016. REUTERS/John Sommers II - RTSG91V

Employees of Joe's Pizza build a makeshift memorial to the late Muhammad Ali near a mural in New York, U.S., June 4, 2016. REUTERS/Lucas Jackson TPX IMAGES OF THE DAY - RTSG0E1

Fans of the late Muhammad Ali, the former world heavyweight boxing champion come to pay their respects at the Ali Center in Louisville, Kentucky, U.S. June 4, 2016. REUTERS/John Sommers II TPX IMAGES OF THE DAY - RTSG1E2

A memorial to honor Muhammad Ali, the former world heavyweight boxing champion after he died at the age of 74 on Friday at the Louisville Islamic Center in Louisville, Kentucky, U.S. June 5, 2016. REUTERS/John Sommers II - RTSG59B