Heavily armed police officers cornered a busy street in Manhasset on Saturday.
The Nassau County Police Special Operations Team arrived in full force at Plandome Road after receiving word that a mentally disturbed person was threatening family members.
Police have not yet identified the suspect but said he is known to have had weapons in the past.
Plandome Road and a portion of Dennis Street were closed for hours and detectives were seen interviewing neighbors in the area.
Detectives say the suspect was placed into custody without incident.
Plandome Road was reopened after the incident.