Officers are also conducting a major search of a property in Sunbury-on-Thames, a town just outside London and about four miles (six km) from Hounslow.
Local media said the home belongs to a couple who have fostered hundreds of children, including refugees. The leader of the local authority was quoted as saying the 18-year-old was an Iraqi who had come to Britain as an orphan aged 15.
The 21-year-old is a Syrian national who had lived in Britain for a number of years, according to the media reports. British police have declined to confirm the identities of those being questioned, which is common practice.
Interior minister Amber Rudd said on Sunday the two arrests suggested it was not a “lone-wolf” attack but there was no evidence Daesh was involved.
Friday’s bombing was the fifth major attack regarded by authorities as a terrorist incident in Britain this year. Daesh militants have claimed credit for other previous attacks, including two in London and one at a concert by American singer Ariana Grande in Manchester.
British officials have said there is scant evidence the group orchestrated those attacks, but those responsible might have been radicalised by Daesh online propaganda.
Article Appeared @https://www.dailysabah.com/europe/2017/09/18/no-evidence-to-link-london-attack-directly-to-terrorist-groups-us-sources-say