( CNN ) -- Visitors be warned : Security around the White House about to intensify . In the wake of last week 's unprecedented security breach , the Secret Service is planning to increase surveillance around 1600 Pennsylvania Avenue . Secret Service Director Julia Pierson has ordered a full review of Friday 's incident . Omar Gonzalez , an Iraq war veteran , is accused of carrying a small knife , scaling the White House fence , sprinting roughly 70 yards across the North Lawn and making it pass the North Portico doors , which were not locked . Investigators said they later found more than 800 rounds of ammunition , plus two hatchets and a machete , in his car . Here 's a look at four possible measures the Secret Service could implement to increase the security around what 's supposed to be the most fortified residence in the country : . 1 . Increase the number of agents patrolling the grounds . The uniformed division of the Secret Service -- the part of the agency responsible for patrolling the premises -- is immediately visible walking past the White House . They 're on the lawn , they 're on the roof , and most notably , they 're carrying some very intimidating rifles . White House security was increased immediately after Friday 's breach , but permanently adding more guards on the lawn and around the entrances would help prevent jumpers and make it easier to catch anyone who successfully jumps in the future . A federal law enforcement official tells CNN 's Jim Acosta that this is a step the service plans to take , with officers patrolling the area in greater numbers and `` looking for individuals who do not look like tourists . '' 2 . Expand the barrier around the entrance . Creating an additional no-go zone around the fence separating the public from the White House grounds is another possible option for the Secret Service . Despite the fence and the armed guards , the White House North Lawn is relatively accessible to the public . Pedestrians can walk right up to the wrought-iron gate , and partial closures of the North Lawn -- because someone on the public side of the gate threw a bag or dropped something on the White House side of the gate -- are common . Earlier this year , a toddler even managed to squeeze through the gate . The approachability of the White House is of course a major draw for visitors , and the optics of an additional perimeter could be problematic . `` The White House is still the people 's house , and we are long passed the days when anybody could walk up and get in , but the fact that anybody could walk so close to it -- I think makes an important and powerful statement in a democracy , '' said Jeffrey Engel , director of the Center for Presidential History at Southern Methodist University , told CNN . `` Keeping the White House within public reach , if you will , sends an important political message , '' said Engel , who specializes in presidential security . 3 . Set up metal detectors around the premises . This would be the most complicated and likely controversial security measure to implement . Metal detectors are set up inside the gates that visitors must pass through to continue to the White House , but nothing is on the outside of the gates . In addition to the optical problems , setting up this measure would bring about a lot of logistical questions : Where exactly would they be ? Which law enforcement agency would be responsible for staffing them ? Which agency would pay for them ? This step is also the most unlikely ; law enforcement officials tell CNN that they wo n't be going up on Pennsylvania Avenue 's pedestrian area . 4 . Always lock the doors . All of the details of Friday 's breach are surprising , but perhaps the most shocking of all was that the North Portico doors -- a large main entrance to the White House -- were not locked . `` They should lock the door , '' Ronald Kessler , author of `` The First Family Detail '' and outspoken critic of the Secret Service , said . `` It 's just common sense . '' The North Portico entrances are frequently used , and that 's why they are not always locked , but the doors were not in use on Friday at the time of the intrusion . Josh Earnest , White House press secretary , told reporters on Monday that going forward , those doors will be locked when not being used . Tough time for the Secret Service . Friday 's breach is just the latest embarrassing incident for the U.S. Secret Service . The agency has not had a great run of it in recent years -- from the prostitution scandal in Colombia in 2012 , to the incident in the Netherlands earlier this year in which three agents were sent home for drinking . The attention on the Secret Service is counter to the entire purpose of the organization , Engel notes . `` They would love to be secret . If you never see them , then they are doing their job , '' Engel said . `` If we are never talking about them , then they are doing their job the way that they want . The last thing that they want is for people to be discussing them . '' President Barack Obama reiterated his support for the agency that protects him on Monday . `` The Secret Service does a great job . I am grateful for the sacrifices they make for me and my family , '' he told reporters . CNN 's Jim Acosta contributed reporting .
Secret Service under criticism after an armed man was able to enter North Portico doors . New security measures are being considered in wake of the breach . One measure could be increasing the number of agents patrolling the grounds . Another one would be the installation of more security cameras outside the gates .