NEW YORK (AP) — A person familiar with the construction of the Sept. 11 museum in New York City says it will be delayed by disputes over redevelopment costs.

A memorial at the trade center opened in September on the 10th anniversary of the 2001 attacks. A museum showcasing artifacts from the attacks was to open on the 11th anniversary next year.

But a person familiar with the construction said Monday that will be delayed, but it's not known for how long. The person spoke to The Associated Press on condition of anonymity because talks are ongoing.

The dispute is between the National September 11 Memorial & Museum foundation and the Port Authority of New York and New Jersey.

It was first reported in The Wall Street Journal (http://on.wsj.com/vXHMsR).

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