Pakistani police say they have detained another suspect after an overnight raid on a house in Karachi as they try to close in on the kidnappers of US reporter Mr Daniel Pearl.
Police said they now had 14 suspects in custody and had identified four more they believe may have masterminded the kidnap of Mr Pearl just over two weeks ago.
"Police raided a house and detained someone on tips gathered from other detainees," a police source said. "Since January 23, the police have detained over 70 people but released most of them after interrogation".
Wall Street Journalreporter Mr Pearl (38) disappeared in Karachi as he tried to contact radical Islamic groups, and trace links between bin Laden's al-Qaeda network and alleged shoe-bomber Mr Richard Reid.
In the following week, various media organisations received two e-mails from the previously unknown National Movement for the Restoration of Pakistani Sovereignty, threatening to kill Mr Pearl if the United States did not release its prisoners from the Afghan war.
Both e-mails included photographs of Mr Pearl, one showing him bound in chains with a gun to his bowed head - an apparent reference to photographs of al-Qaeda prisoners held at a US naval base in Cuba.
The kidnappers said Mr Pearl was being kept in "inhumane" conditions to protest the treatment of the captives in Cuba.
Despite not having heard anything from Mr Pearl's abductors for more than a week, investigators say they are hopeful the US reporter is still alive somewhere in Pakistan.