A decision to barricade the National World War II Memorial in Washington, D.C., to visitors during the federal government shutdown attracted national attention Wednesday when a group of veterans removed the barriers to visit the memorial, but it remained unclear who was responsible for the memorial's forcible closure.

Judicial Watch sent a Freedom of Information Act request Wednesday to the Department of the Interior for records that could reveal who made the decision to bar the public from the memorial.

Judicial Watch submitted a FOIA request for all records related to the cancellation of veterans' group's trips to the memorial, as well as records related to blocking public access to other monuments in Washington, D.C., due to the shutdown.

A group called Let the Vets In tweeted on Wednesday morning: "Spokesman for @nps says they were told to barricade the #WWIIMemorial by the White House OMB."

The spokesman apparently made the comment at the World War II memorial, where veterans, members of Congress and the media had gathered Wednesday to protest the closure.

But because most National Park Service employees were furloughed during the shutdown — except the ones required to block access to the monuments — an NPS spokesman was not available to comment. NPS is part of the Interior Department and has about 22,000 employees across the country.

NPS closed other monuments and parks during the shutdown, even sending employees to guard sites NPS doesn't actually run.