A bullet has struck the ballistic glass of an exterior window of the White House and another round has been found nearby, AFP reported citing News4.

The news outlet said the Secret Service - the bodyguard detail charged with protecting the US president and other top officials - began investigating after an incident on Friday, November 11, when gunshots were heard near the White House.

The probe has not yet connected the bullets found on the White House grounds to Friday's incident.

The Secret Service did not immediately respond to questions about the report.