updated 9/10/2012 8:04:46 PM ET 2012-09-11T00:04:46

An agreement that paves the way for the completion of the Sept. 11 museum at ground zero has been reached a day before the 11th anniversary of the terror attacks.

The agreement between the Port Authority of New York and New Jersey and the foundation that controls the National September 11 Memorial & Museum was announced Monday. The Port Authority owns the World Trade Center site.

The museum was supposed to open this month, but construction all but ceased a year ago because of a funding squabble between the foundation and the Port Authority.

The underground museum is to house such artifacts as the staircase workers used to escape the attacks.

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The National September 11 Memorial at dusk

The memorial includes a plaza where waterfalls fill the fallen towers' footprints. It opened last year and has attracted millions of visitors.

Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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