Committees representing survivors and first responders of the September 11 attacks are calling for changes to the Memorial Museum.
They say they're angry over the language used at an exhibit called "After 9/11," where the word "claimed" is used to refer to workers who got sick while working at the site in the weeks after the attacks.
In a letter sent to the head of the National 9/11 Memorial and Museum, advocates say the word casts doubt on the links between time at the site and the health problems that workers and responders are suffering from now.
They say another museum display seems to defend the government's assessment of the air quality at the site.
Museum officials say they look forward to meeting with the heads of the committees and released a statement which reads, in part, "As a new institution examining a history that is still unfolding, if ever there is a way for us to improve our exhibitions, we have done so, and will continue to consult members of the 9/11 community."