Ahead of President Joe Biden’s speech here Wednesday, local police lost a document that detailed sensitive security information related to the president’s visit.

A local resident is believed to have found the document on a street in Belfast, a U.S. law enforcement official said, confirming the authenticity of the paper on the condition of anonymity.

The document contained names of Belfast police and postings, but nothing related to the Secret Service’s operations, which oversees the president’s security during foreign trips, or its security plans.

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The security breach came as the terrorism threat in Northern Ireland was considered “severe” for Biden’s visit to mark the 25th anniversary of the Good Friday Agreement, which ended three decades of civil war in Northern Ireland.

Read more: USA Today