Local council chief Ian Harvey says he believes the 18-year-old is an Iraqi orphan who moved to the United Kingdom when he was 15.
People were injured in both the attack and then the stampede which followed as commuters ran for their lives.
"The arrest was carried out by officers from the Met's Counter Terrorism Command, supported by colleagues from Gwent Police and the Welsh Extremism and Counter Terrorism Unit (WECTU)".
THIS is the moment anti-terror cops swooped on a "smiling" Parsons Green bombing suspect last night before officers arrested two more men this morning.
"This continues to be a fast-moving investigation".
The extra funding will go to forces including Greater Manchester Police and the Metropolitan Police to assist with their response to the threat of terrorism and help meet costs relating to the recent attacks, including the Arena bombing.
A third man, 25, who was arrested at a separate address in Newport shortly after 7pm on Tuesday, and two other suspects detained on Saturday remain in custody, taking the total number of arrests to five.
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Police said Sunday that a 21-year-old man was arrested late Saturday in Hounslow in west London under the Terrorism Act. The couple's Surrey house was raided on Saturday.
Farroukh was the second person to be arrested after an unnamed 18-year-old man was stopped by officers near the port of Dover on the evening of September 15, hours after the attack that sent a ball of fire along a carriage of the eastbound District Line train from Wimbledon at the Parsons Green station.
Sunbury is where the first arrest of a so-far unnamed man, 18, occurred.
The apparent police interest in the shed comes two days after CCTV footage recorded just outside the house was obtained by ITV.
The attack - the fifth in six months in the Uk - has been committed in a train full of peak hour to 08: 20am in the station of Parsons Green, located in a wealthy area of south-west London, in the middle of an explosive device by hand.
The suspects remain in custody at a south London police station.
And you will have heard consequently the Home Secretary's announcement that the threat level has reduced from Critical to Severe which of course means that an attack is highly likely."Members of the public will be wondering what that means in terms of their travel into work tomorrow".