Menino says items in the memorial, which include stuffed animals, sneakers, flowers and notes, will be taken to the city archives on Tuesday. He says some items already were taken there to prevent further deterioration.
Menino says a Remembrance Committee will be formed to oversee the creation of a permanent memorial to victims and survivors. He says survivors and victims' family members are welcome to serve on the committee.
The April 15 blast killed three and injured more than 260.
More than 6,400 athletes gathered Sunday on Boston Common for a 10-kilometer race. Marathon men's champion Leslia Desisa of Ethiopia returned his winner's medal to Menino to honor the city and the bombing victims.