Police in Northern Ireland have begun a criminal investigation into the disappearance of a 21-year-old man in Co Derry.
Lee Johnston was last seen more than a week ago in the village of Maghera.
Detectives have arrested a woman, 31, and a man, 33. Both are continuing to help police with their enquiries.
Mr Johnston was last seen around 4pm on Saturday, 7 October, in the Mullagh Park area of the village, but was only reported missing to police the following Friday, 13 October.
Officers said it was "out of character" for him not to have been in contact with his family or friends.
"Police are becoming increasingly concerned for Lee's safety and have begun a criminal investigation into his disappearance," said district commander Superintendent Michael O'Loan.
Mr Johnston has been described as having short brown hair, blue eyes and is around 5' 9" in height.
When last seen he was wearing a blue hooded top and tracksuit bottoms.
"I am appealing to anyone who was travelling through the Mullagh Park area in Maghera between 3-4pm on Saturday October 7th to think if they saw Lee or anything unusual. If you did, please report it to police immediately," Superintendent O'Loan said.
Anyone who may have relevant CCTV or dashcam footage are also being asked to come forward.
