U.S. authorities are investigating two bullets that hit the White House, including one they say broke an exterior window but was stopped by a layer of bulletproof glass.

The U.S. Secret Service, which is tasked with protecting the president and other top officials, is looking into whether the bullets found Tuesday were connected to reports of gunfire at the White House on November 11.

President Barack Obama and his wife, Michelle, were not home at the time. On Friday, they were in California, before heading to Hawaii, where Mr. Obama hosted an Asia-Pacific economic summit.

Police have issued an arrest warrant for a 21-year-old man believed to be connected to the November 11 incident.

Authorities began pursuing the suspect, identified as Oscar Ortega-Hernandez, after linking him to an abandoned car found Friday with a weapon in it.

Ortega-Hernandez is described as a Hispanic male with an arrest record in three U.S. states and several tattoos, including the word “Israel” on his neck.