The Statue of Liberty and Liberty Island were both been evacuated Friday afternoon as a precaution amid security concerns, the National Parks Service said.

The evacuation of the monument began shortly before 1 p.m., parks officials say. A security sweep of Liberty Island is being done.

Tourists visiting the site tweeted photos of throngs of people waiting to leave a pier on Liberty Island.

It’s not clear what prompted the evacuation.

It’s not clear whether ferry service to Liberty Island has been affected.

(AP)