WASHINGTON--The Secret Service is reviewing its response to a White House security breach after an intruder scaled a fence Friday and ran through a set of doors into the executive mansion.

A man identified as Omar J. Gonzalez, a 42-year-old from Copperas Cove, Texas, made it over the White House fence along Pennsylvania Ave., across the north lawn and just inside the doors of the North Portico, said Brian Leary, a Secret Service spokesman.

Mr. Gonzalez was arrested and transported to George Washington University Hospital for medical evaluation and the incident is under investigation, the Secret Service said. Mr. Gonzalez was unarmed.

"The Secret Service will review the response to ensure proper protocol was followed," Mr. Leary said.

Mr. Gonzalez couldn't immediately be reached for comment.

The first family wasn't at the White House at the time of the breach. President Barack Obama and his daughters had departed the complex earlier in the evening for an overnight trip to Camp David.

But the incident triggered an evacuation of much of the White House and is forcing the Secret Service, charged with protecting the president and his family, to review its security procedures.

Security is always tight around the White House and the grounds are regularly subject to lockdowns, often because tourists absent-mindedly leave behind backpacks or other parcels, but also due to fence-hoppers and object-throwers.

A man was arrested for trying to unlawfully enter the White House Saturday, less than 24 hours after Mr. Gonzalez made it into the White House, the Associated Press reported. A Secret Service spokesman said a man showed up at one of the White House gates on foot, then showed up in his a car at another gate and pulled into the vehicle-screening area. He refused to leave and was arrested for unlawful entry, the AP reported.

Earlier this month, a man wearing a Pikachu hat and carrying a stuffed doll of the Pokémon character jumped the White House's north fence. He was quickly stopped by Secret Service officers.

In a more lighthearted incident, a toddler squeezed through the White House fence last month. Officers were able to quickly able to return the child to his parents.

A law-enforcement official said that because Pennsylvania Avenue remains open to pedestrian traffic, fence-jumpers are an occasional problem.

But Friday's incident raised broader questions about security.

"The location of arrest at the White House is not acceptable to the Secret Service and will be closely reviewed," the official said.

Write to Jeffrey Sparshott at jeffrey.sparshott@wsj.com

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