The incident happened around 3:45 p.m. Thursday, on the 2200 block of Fairfax Drive.
According to police, the man entered his brother’s bedroom while he was sleeping, locked the door and then pressed the knife against him while making threatening remarks. The brother then tried to defend himself and was stabbed three times, said Arlington County Police spokesman Dustin Sternbeck.
The victim was rushed to George Washington University Hospital and is expected to survive.
The suspect remained in the apartment and was taken into custody by police.
“Pablo Rivera Pena, 21, of Arlington, VA was arrested and charged with malicious wounding and abduction,” according to the crime report. “He was held without bond.”
So far there’s no word on a motive.