Officers investigating the disappearance of Lee Johnston have arrested a 31-year-old woman and a 33-year-old man.
Mr Johnston, who is from Coleraine, was last seen in the Mullagh Park area of Maghera on Saturday, October 7.
He was first reported missing on the evening of Friday, October 13.
Police are currently at the scene close to the entrance of Mullagh Park. A cordon is in place.
The PSNI said it is out of character for Mr Johnston not to have been in contact with his family since he was last seen.
He is described as having short brown hair, blue eyes and is about 5ft 9ins in height. When last seen Lee was wearing a blue hooded-top and tracksuit bottoms.
PSNI Supt Michael O’Loan said: “Police are becoming increasingly concerned for Lee’s safety and we have now launched a criminal investigation into his disappearance.”
Officers appealed to anyone travelling through Mullagh Park between 15:00 and 16:00 BST on 7 October to contact them if they have any information.
They also urged anyone with dash-cam, CCTV or mobile footage to get in touch.