NEW YORK | The producers of “World Trade Center” are donating $1.3 million to the Sept. 11 memorial, keeping a promise to give 5 percent of the film’s opening weekend box office receipts to help build it.

Another $1.3 million from the weekend’s proceeds will be split equally among three Sept. 11-related charities, the World Trade Center Memorial Foundation said.

The Paramount Pictures film opened nationwide on Aug. 9 and has earned more than $50 million at the box office. The movie stars Nicolas Cage and Michael Pena as police officers trapped for hours in the trade center rubble.

The film’s producers had promised to donate 10 percent of its Aug. 9-13 box office proceeds to the foundation and the three charities.

The donation raises the private money available to build the memorial to $132.3 million; the memorial’s cost is put at more than $650 million.

The Port Authority, which owned the trade center, and the Lower Manhattan Development Corp. rebuilding agency are covering the rest of the costs.

Construction on the memorial began this year, and officials say it will open in 2009.

The other charities to split donations from the Oliver Stone film are Tuesday’s Children, a services organization for children who lost parents on Sept. 11; the Tribute WTC Visitor Center, created by a Sept. 11 family group and set to open next week; and the New York Police and Fire Widows’ and Children’s Benefit Fund.

The Associated Press