The FBI just arrested a man who plotted an attack on the White House tomorrow — here's how they caught him

According to legal documents filed Wednesday, the FBI arrested a 21 year-old man who was planning an attack on several monuments at the capital, including the White House.

Several reporters tweeted about the details of the arrest.

The suspect planned to approach the White House "from the back road," cause a distraction for police, and then enter inside, according to law enforcement. The filing also indicates he was planning to attack the Washington Monument and the Lincoln Memorial.

Law enforcement allege that he had in his possession a "hand-drawn diagram of ground floor of the West Wing" of the White House.

The man was identified as Hasher Jallal Taheb, and CNN's Nick Valencia described his appearance at the federal courthouse as "thin build, long beard, shaggy black hair."

Taheb is from the Atlanta, Georgia area, and officials say they were alerted to the threat from the tip of an acquaintance who was alarmed by how the suspect had radicalized himself.

He was arrested as he was trying to trade his vehicle for explosives in Georgia.

Officials say he plotted his attack on his own, and without the aid of any group or organization.

Here's a news video about the alleged terror plot: