Arising out of the incident a 23-year-old man has been charged with obstruction after the incident.
He is due to appear at Londonderry Magistrates Court on Monday, June 27.
A PSNI spokesperson said: “A device was thrown at a house in the area. Approximately 20 homes were evacuated as the area was cordoned off. The device was later declared a hoax and the residents of the evacuated homes were able to return at approximately 7.15am.
“Two arrests were made. A 23-year-old male was arrested for obstruction and money warrants. A 26-year-old male was arrested for criminal damage and possession of an explosive device.”