UPDATE on March 17 at 1:23 pm:
The 26-year-old man who breached White House grounds last Saturday was roaming the south lawn for 15 minutes or more before he was subdued, a Secret Service official told CNN. Officials are investigating the security failures that allowed the intrusion to go on for so long.
The official said Johnathan Tran set off multiple alarms but was able to avoid other sensors. "The response to the alarm was lacking, and found (the suspect) vulnerabilities in the system," officials said.
Following the incident, Secret Service officials have launched a formal Mission Assurance Review.
Here's a timeline of what happened
The source added that Tran was seen lurking around Pennsylvania Avenue as early as 6 pm, nearly six hours before he was arrested on White House grounds. Video surveillance footage revealed that Tran first jumped a fence in the Northwest corner of the Treasury Building, which is adjacent to the White house. That breach activated an alarm in the Treasury Moat.
Secret Service officials responded to the alarm, but Tran had snuck beyond one Secret Service post and inched towards the White House. Tran's movements set off another alarm but avoided detection behind a pillar of the East Wing entrance. Tran then jumped a wall before traversing along the East Wing.
Several additional sensors went off, but it remains uncertain if they were fully investigated at the time of the breach.
UPDATE 4:08 pm | Here's what we know...
- President Donald Trump reacts
- Intruder identified, will appear in court for arraignment Saturday
- The intruder said he had a meeting with the president
According to CNN's Washington correspondent, the White House intruder has been identified as 26-year-old California resident Jonathan Tran, who claimed to know the president.
Trump praised the service for doing "a fantastic job," in arresting the "troubled person."
BREAKING: White House jumper suspect identified as 26-year-old Jonathan T. Tran. He was apprehended with a California's driver's license.— Ryan Nobles (@ryanobles) March 11, 2017
A White House intruder wearing a backpack has been arrested after breaching onto White House grounds around 11 p.m. on Friday, according to CNN. The man reportedly scaled a fence on the South grounds.
President Trump was at the residence during the breach, though he was never in any immediate danger. The U.S. Secret Service confirmed the incident Saturday morning.
WATCH | A man scaled the White House fence late Friday night
The name of the suspect remains unidentified, however, his backpack contained no hazardous materials after being screened by security officials. There appeared to be "nothing of concern" after officers had swept the White House grounds.
Homeland Security Secretary John Kelly has been briefed about the situation.
Following the incident, the White House was placed under "orange" security level, one of the highest security measures.
This story is developing.