The number, down 30 people from 150 in 2017, is far greater than the number of people arrested for alleged ties to international extremist groups.
There were 110 people arrested in 2017 on suspicion of being inspired by foreign terrorist organizations such as Islamic State or al-Qaeda, according to figures shared with the Post showed. Of those, about 30 people faced terrorism charges in 2017 and nine faced such charges in 2018.
According to the Washington Post, since US federal law does not designate domestic groups as terrorist organizations, none of the people suspected of domestic terrorism were charged with terrorism.
A senior law enforcement official told the Post that one in four counterterrorism suspects are detained by state and local authorities.