The daughter-in-law of hate preacher Abu Hamza has been arrested for allegedly trying to smuggle a mobile phone sim card into his jail under her burka.
Chayme Hamza, 26, was apprehended by guards during a routine search when she went to visit the firebrand cleric in Belmarsh high security prison in south-east London last Friday.
Police were called and she was arrested on suspicion of bringing a prohibited article into a prison.
The sim card was found in a pocket in clothing under her burka, according to The Sun.
Hamza's eldest son Mohamed Kamel Mostafa - Chayme's husband and a convicted terrorist - was arrested over the same incident the next day.
The pair have been bailed until February pending further inquiries, Scotland Yard said.
The arrests have raised fears that Hamza has had access to a mobile phone while he awaits extradition to the U.S on terror charges.
The 52-year-old was jailed for seven years in February 2006 for inciting murder and race hate. He is challenging attempts to extradite him.
That case was delayed in July by the European Court of Human Rights in Strasbourg, which called for further submissions over the length of his sentence and the conditions he would experience if extradited to ADX Florence, a so-called "supermax' prison in Fremont County, Colorado.
A Scotland Yard spokesman said police were called over the woman visitor to Belmarsh at about 3.45pm last Friday.
He said: 'Officers attended and a 26-year-old woman was arrested on suspicion of bringing a prohibited article into a prison, contrary to the Prison Act 1952.
'On December 18, a 29-year-old man voluntarily attended a south London police station and was arrested on suspicion of bringing a prohibited article into a prison, contrary to the Prison Act 1952.'
A Prison Service spokesman said: 'During a routine search on Friday, a visitor entering HMP Belmarsh was found to be in possession of a prohibited article. Prison officers confiscated the item and contacted the police.'
Mostafa served three years in jail for spearheading a bombing campaign in the Yemen in 1999.
He was one of three of Hamza's sons jailed in May 2009 for their part in a £1million luxury car scam.
They were in a seven-strong gang that targeted BMWs, Range Rovers and Mercedes left in car parks in London while their owners were away for long periods.
Mostafa admitted fraud and received a two-year prison sentence.