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The London-based sibling of two Islamic State terrorists who were known associates of so-called Jihadi John has been arrested in Portugal, according to reports.

Romulo Rodrigues da Costa is said to have been held in Sintra by anti-terror police on Sunday night. His brothers Celso and Edgar Rodrigues da Costa, who died fighting for IS, married London sisters Reema and Zara Iqbal.

The women from Canning Town were stripped of their UK citizenship earlier this year after fleeing to Syria.

Portugal’s judicial police confirmed it had held “an individual suspected of lending support to ISIS fighters” in an operation. A spokesman, who did not name Romulo, said: “A house search was carried out where the suspect was located. The detainee has been based in the UK for several years.”

Portuguese weekly Expresso claimed that Romulo had operated in London with two identities, one a music producer and the other an IS recruiter.

Reema and Zara Iqbal were said to have been part of a five-strong all-female terror cell that travelled to Syria in 2013 with their husbands. Celso, 28, and Edgar, 31, were radicalised in London after travelling to Britain to seek careers as footballers. Former Harrods sales assistant Celso appeared in an IS propaganda video where he boasted of slaughtering infidels.