A 44-year-old woman has been arrested in connection with a petrol bomb attack that left a Londonderry man fighting for his life.
Police said the woman was detained in the Londonderry area on Sunday afternoon.
"She is currently assisting police with their inquiries," a PSNI spokesman said.
On Saturday, a senior officer said they were treating the attack as attempted murder.
The 45-year-old victim suffered up to 35% burns including injuries to his face and neck after being struck by a petrol bomb which was thrown through the living room window of his home at Ben Varden Avenue in the Waterside area of the city on Friday night.
He had to be pulled to safety by two neighbours who risked their own lives to enter the burning building.
The victim has undergone a series of operations at the Royal Victoria Hospital in Belfast where his condition has been described as serious but stable. Detectives have not yet been able to speak to him because of the extent of his injuries.
Two youths who used scarves to conceal their identity were noted running away from the scene.
PSNI Inspector Jon Burrows, area commander in Foyle, said: "He was pulled from the property by two neighbours who risked their own lives. Contrast that with the actions of the two cowards who threw the petrol bomb. But for the actions of those neighbours this man could possibly have died."
Police later confirmed they had arrested a 25-year-old man in connection with the petrol bomb attack. A PSNI spokesman said he had been detained in the Londonderry area and was "currently assisting police with their inquiries".