US Secretary of State Marco Rubio said on X that the State Department has suspended the issuance of visas to all individuals traveling with Afghan passports.
He said there is no greater priority for the United States than protecting national security and public safety.
The State Department said in a separate post that it was taking all necessary measures to protect the country, according to Al Jazeera.
U.S. Citizenship and Immigration Services has announced it is suspending the processing of all immigration applications from Afghan nationals until further notice following the attack on the National Guard.
On Wednesday, a man armed with a revolver opened fire on police officers stationed near the White House, wounding a man and a woman.
On Thursday, Attorney General Pam Bondi said prosecutors would seek the death penalty if either victim dies.
US President Donald Trump later announced that police officer Sarah Beckstrom, 20, had died in hospital and her colleague, 24, remained in critical condition.
CIA Director John Ratcliffe said the suspect is an Afghan national who worked for the CIA and other U.S. government agencies in Afghanistan before immigrating to the United States in 2021.
US media identified the suspect as 29-year-old Rahmanullah Rakanwal.
MNA