A banner reading "Refugees welcome" was put up illegally on the base of the Statue of Liberty Tuesday afternoon, authorities said.

The banner, 3 feet by 20 feet, was unfurled atop the pedestal around 12:50 p.m., according to National Park Service police. It was affixed to the outside of the public observation deck at the base of the statue by nylon rope.

Patriots unfurled a massive banner at the foot of Lady Liberty.



When injustice is being perpetuated, we must all stand up#RefugeesWelcome pic.twitter.com/rz3Qtwzqco — Alt Lady Liberty (@AltStatLiberty) February 21, 2017

When alerted to the presence of the banner, park rangers immediately made their way to the location to assess how to get it down. They were able to remove it without damaging the monument.

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Visitors began posting photos to social media soon after the banner appeared.

Visiting the Statue of Liberty today and this "Refugees Welcome" banner is creating lots of conversation pic.twitter.com/rpRK8AhI1U — Tim O'Shei (@timoshei) February 21, 2017

The National Park Service said affixing signs to the Statue of Liberty or its pedestal is "strictly prohibited" and that an investigation is underway to identify the people who placed the banner there.