Pakistani arrested during terror investigation found dead in cell

A Pakistani man arrested by the FBI in its investigation into the US terror attacks has been found dead in his cell.

The man was found dead at the Hudson County Jail in Kearny.

The jail's medical director says he believes the 55-year-old man died of a heart attack.

An autopsy is under way to determine the cause of death.

Doctors tested nasal swabs, blood and tissue for anthrax, and all the tests were negative for the bacteria, officials say.

The man's cellmate and a handful of guards also received nasal-swab tests for anthrax, which also came back negative, jail administrator Kurt Thoens says.

The man was arrested on September 19 as part of the investigation into the terrorist attacks on New York and Washington.

Anicette said that connection led authorities to test the man's body for anthrax as a precaution.

The man's body showed no signs of trauma or foul play, authorities say. He was being held on immigration charges, authorities say.

The man had complained recently of pain in his gums, saw a dentist and was given tetracycline, Mr Delemos says.