Three men and a woman continue to be questioned by police after the attempted murder of a man in Derry during a horrific petrol bomb attack at his home.
Police are treating the petrol bomb attack in the Ben Varden Avenue area on the evening of Friday as attempted murder.
A 20-year-old man was arrested in the Derry area this afternoon in connection with the attack.
Three others - including two men aged 24 and 25 along with a 44-year-old woman - arrested earlier still remain in custody helping police with their enquiries.
Thomas Curry (46) is being treated at the Royal Victoria Hospital in Belfast after he was set on fire at his home. Two men smashed a window of his house and then fired the petrol bomb inside where he was sitting on a settee.
The attack happened at about 11.10pm on Friday.
The man had to be rescued by two neighbours.
PSNI Inspector Jon Burrows, area commander in Foyle said he was lucky to be alive.
"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," said Inspector Burrows.
The two suspects who were dressed in grey hooded tops and used scarves to cover their faces made off on foot in the direction of Dervock Place.
Inspector Burrows said police were still working to establish a motive and urged anyone with information to come forward.
"We would appeal to anyone who has information that could help our investigation to speak to us," said the senior officer.