Firing outside the White House, Trump moved to a safe place

The suspect who opened fire outside the White House in the US capital, Washington DC, was shot dead by security forces.
The suspect was shot dead by Secret Service guards outside the White House in Washington, D.C., according to CNN. The suspect was possibly armed. The injured suspect was shifted to the hospital.
According to the news agency, US President Donald Trump was engaged in a media briefing at the time of the incident. He was briefed during the briefing. After which he left the briefing.

Minutes later, President Trump returned to the press conference, saying he did not know the man injured in the shooting and did not know his motive. As far as I understand the arrested person was armed.
He said the shooting took place outside the White House compound and was not a security breach.
President Trump praised the US Secret Service and said they were the best people. With the Secret Service, they feel extremely secure.
Security has been beefed up outside the White House following the incident