(Updated at 3:40 p.m.) FBI Joint Terrorism Task Force agents are conducting some sort of an investigation at a house in Douglas Park.

The FBI, NCIS and Arlington County Police are on the scene on the 1600 block of S. Randolph Street. Agents could be seen talking to two men outside the home, where the FBI says it was executing a search warrant.

ACPD spokesman Dustin Sternbeck confirms this is an “offshoot” related to today’s arrest of a Moroccan man by the FBI. The man apparently planned on conducting a suicide attack on the U.S. Capitol.  He was reportedly an illegal immigrant living in Alexandria.

The home has been owned by the same man and woman since 1997, according to Arlington County property records.