British media are naming one of the suspects arrested over Friday's tube bomb as 21 year-old Yahyah Farroukh.
He's thought to have lived at a house in Surrey with an elderly couple well known for fostering child refugees.
An 18 year-old arrested on Saturday at the port of Dover is also thought to have lived there - he reportedly moved to the UK from Iraq at the age of 15.
The device which detonated at Parsons Green on Friday left 30 people injured.
Rachel Venables reports.
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