(Updated at 9:15 p.m.) A residential street in Ballston has been blocked off by police while Arlington’s bomb squad investigates “concerning materials” found in a home.

The discovery was made by police while executing a search warrant on N. Stuart Street between 11th Street N. and Washington Blvd. The raid happened in response to a suspect making violent threats against an individual, said Arlington County Police Department spokeswoman Ashley Savage.

The suspect is in custody and residences immediately surrounding the house have been evacuated as a precaution, Savage said. The road closure is expected to remain in place for an extended period of time.

In addition to Arlington County police and firefighters, federal law enforcement could also be seen arriving on scene. Savage said ACPD requested the assistance of “federal partners” in the investigation.

The Arlington County Fire Department bomb squad truck arrived at the scene around 4:30 p.m. Later Tuesday night, the police department said that “evidence of bomb making materials were recovered” and that the street remained closed due to an “additional suspicious item” being found.

At 9:10 p.m., police said the all clear had been given and the road would reopen soon.

UPDATE: Evidence of bomb making materials were recovered during the execution of the search warrant. The all clear has been given and there is no apparent ongoing threat to public safety. Police remain on scene investigating. Additional charges against the suspect are pending.

— ArlingtonCountyPD (@ArlingtonVaPD) March 24, 2021

UPDATE: The all clear has been given on the suspicious item and the road closure will be lifted shortly. Police remain on scene investigating. Additional information, when available, will be posted in our newsroom at https://t.co/0rWcbdXlWY.

— ArlingtonCountyPD (@ArlingtonVaPD) March 24, 2021