Two more men have been arrested in South Wales over the Parsons Green terrorist attack, police say.
The pair, aged 48 and 30, were arrested in Newport just after 5am.
It follows the arrest of a 25-year-old man in the city on Tuesday night after a counter-terrorism raid.
The latest arrests bring the number of people being held over Friday’s bomb attack to five.
Two other men, aged 18 and 21, are still in custody in connection the attack in southwest London.
Two properties in Newport are being searched by officers
Detectives were earlier given more time to question the pair arrested at the weekend.
Yahyah Farroukh, 21, is listed as living at an address in Stanwell, Surrey, which was searched by officers on Sunday.
Yahyah Farroukh, 21, was arrested in west London
The 18-year-old man, who was arrested in Dover, is suspected of planting the device, which exploded on a District line train shortly after it pulled into the station.
Magistrates have granted warrants allowing Farroukh to be held until Thursday, and the younger suspect until Saturday.
ISIS claimed responsibility for the Sept. 15 explosion at the Parsons Green Tube in Fulham, London, U.K. At least 29 people were injured – none in a serious or life-threatening condition. The terror threat level in the U.K. has been raised from “severe” to “critical” while the police are on the lookout for the suspect.