(CNN) — A man carrying a backpack was arrested Friday night after breaching security at the White House complex and was discovered by a Secret Service officer by the south entrance to the executive residence, officials said.

The incident happened just before midnight while President Donald Trump was at the White House.

A Secret Service source said the intruder might have entered the White House grounds on the east side before making his way near the residence’s south portico entrance.

The White House was placed under security condition “orange,” one of the highest levels of security for the Secret Service.

The suspect was arrested by the Secret Service and taken into custody.

The President was spending the weekend in Washington and was alerted to the incident late Friday night, an administration official said.

There have been numerous instances of people trespassing on the White House grounds over the last several years.

In one notable instance in 2014, 42-year-old Omar Gonzales, of Copperas Cove, Texas, made it through the north portico doors with a three-and-a-half-inch folding knife in his pants pocket, according to the Secret Service. Gonzalez was apprehended just after making it inside the doors, the Secret Service said. The first family was not at the White House at the time.

In another, the Secret Service apprehended Joseph Caputo, of Stamford, Connecticut, on the North Lawn after he scaled the fence wearing an American flag-like cape while the first family was inside the residence celebrating Thanksgiving.