The incident was reported to have occurred in the Meenan Square area of the Bogside on the night of August 15.
The New IRA later said it had fired shots at police officers in the area at the time.
Detective Inspector Clara Heaton said: “Officers carried out searches of two properties this morning – both in the Bogside/Brandywell areas of the city.
“A number of items were seized for examination.
“A 19-year-old woman and a 23-year-old man have been arrested under the Terrorism Act, and taken to the Serious Crime Suite at Musgrave Police Station for questioning.
“Our enquiries continue, and I would reiterate our appeal for anyone with information to contact us on 101 quoting reference number 2217 of 15/08/22.”
Alternatively, information can be provided to Crimestoppers anonymously on 0800 555 111 or online at www.crimestoppers-uk.orgTags: