Watch: How the shooting of two National Guard members unfolded
Two members of the National Guard were shot and seriously wounded just blocks from the White House in Washington DC.
They remain in a critical condition and the suspect, an Afghan national, is in custody.
In response to the attack, President Donald Trump said he would deploy another 500 troops to the streets of the nation's capital.
What happened in shooting near White House?
Just after 14:00EST (19:00GMT) on Wednesday, two members of the National Guard, both from West Virginia, were shot at close range near Farragut Square in downtown Washington DC.
The soldiers had been on a high-visibility patrol near the corner of 17th and I streets, an area where many office workers mill around at lunchtime.
Metropolitan Police Assistant Chief Jeff Carroll said the suspect "came around the corner" and "immediately started firing", adding that the soldiers had been "ambushed".
Muriel Bowser, the mayor of Washington DC, said the incident was a targeted attack.
The location of the shooting, just blocks from the White House, meant a number of law enforcement officials were quickly on the scene to treat the two victims and apprehend the gunman.
The guards members were taken to hospital and remain in a critical condition, officials said on Thursday.
Trump was at his Mar-a-Lago residence in Florida ahead of the US Thanksgiving holiday and not at the White House at the time.
Patel: National Guard members 'brazenly attacked' and in critical condition
What do we know about the suspect?
The Department of Homeland Security named the suspect as Rahmanullah Lakanwal, and described him as "a criminal alien from Afghanistan".
During his apprehension, the suspect was shot four times, law enforcement sources told CBS News, the BBC's US news partner.
ReutersMr Lakanwal is 29 years old and not co-operating with authorities, officials said.
He is said to have come to the US in 2021.
The suspect resided in the state of Washington with his wife and five children.
Watch: US President Donald Trump says alleged gunman was Afghan national
How did he come to the US?
Mr Lakanwal reportedly came to the US in September 2021, under a programme for Afghans named Operation Allies Welcome that existed during the presidency of Joe Biden.
This was during the time period that follow a chaotic withdrawal of US forces from Afghanistan.
The Congressional Research Service estimated that around 77,000 Afghans entered the US under special immigration protections, in place for about a year following that withdrawal.
Mr Lakanwal had a relationship in Afghanistan with the US forces, FBI Director Kash Patel said on Thursday. CIA Director John Ratcliffe said he worked with the intelligence agency.
Mr Lakanwal applied for asylum in 2024, and his application had been granted earlier this year, an official told CBS.
In the wake of the suspect's connection to Afghanistan, Trump has said that the US "must now re-examine every single alien who has entered our country from Afghanistan under Biden".
The president also suspended processing all immigration requests from Afghans.
What will he be charged with?
Mr Lakanwal will be charged with three counts of assault with intent to kill while armed, US Attorney Jeanine Pirro said.
He will also be charged with possession of a firearm during a crime of violence.
The first charges mean he will face 15 years behind bars if found guilty.
Watch: Police chief describes how shooting of National Guard members unfolded
How has Trump administration responded?
Just hours after the shooting, Trump posted a video speaking from Mar-a-Lago in Palm Beach, Florida.
He described the shooting as an "act of terror" and "a crime against humanity".
The president called Mr Lakanwal an "animal" who shot the guard members "at point-blank range in a monstrous, ambush-style attack just steps away from the White House".
In response to the shooting, Trump said he would deploy an additional 500 National Guardsmen.
There are currently nearly 2,200 National Guard troops in the city.
National Guard troops are a reservist force that can be activated to serve as military troops, but have limited power as they cannot enforce the law or make arrests.
Trump deployed troops in August to tackle what the president called "out of control" crime in the nation's capital.
What do we know of the victims?
The victims have be named as Sarah Beckstrom, 20, and Andrew Wolfe, 24.
They are both uniformed members of the West Virginia National Guard, Pirro said.
"They were in DC to keep DC safe," she said at a press conference on Thursday.
ReutersAttorney General Pam Bondi told Fox News that Ms Beckstrom had volunteered to work in the nation's capital over the Thanksgiving holiday.
"She volunteered, as did many of those guardsmen and women, so other people could be home with their families, yet now their families are in hospital rooms with them while they are fighting for their lives," she said.
Both Ms Beckstrom and Mr Wolfe remain in critical condition after being shot multiple times. Both of them are out of surgery.