A seventh man has been arrested by anti-terrorist officers investigating the ricin find in London.
Police are still looking for at least two more people in connection with the discovery of the deadly poison in a north London flat.
Six men - understood to be north Africans - were arrested on Sunday and security experts are trying to establish if they have links to al-Qaeda.
Only small traces of ricin were found in the operation - launched after a tip-off - but there are concerns an amount of poison could have been made at the flat and has been moved.
Scotland Yard said the seventh man, aged 33, was arrested by anti-terrorist branch officers in north London on Tuesday.
He is being held in custody at a central London police station.
Before the latest arrest, security sources said police were looking for at least three more "key individuals" in connection with the case.
It has been revealed that two of the six men arrested on Sunday are teenage asylum seekers aged 16 or 17.
One is from Algeria and the other is believed to be Ethiopian. They were housed in the flat in Wood Green by Islington Council.
The others arrested are in their 20s and 30s.
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Seventh arrest in ricin case (in the uk) 
