Evidence shows the deadly poison could have come from the bombing of an ammunition depot, not from a nerve gas attack.
The exact cause of the inmates' deaths has been the subject of conflicting reports.
A report out of Switzerland suggests the deceased Palestinian leader may have been poisoned with polonium-210, the same radioactive substance used to kill former Russian FSB officer Alexander Litvinenko.
A hidden epidemic is poisoning America. The toxins are in the air we breathe and the water we drink, in the walls of our homes and the furniture within them. The culprit behind this silent killer is lead, vinyl, formaldehyde and thousands more innovations brought to us by the industries that once promised “better living through chemistry."
Authorities believe a letter sent to President Obama containing a suspicious substance that tested positive for ricin came from the same person who mailed an envelope that was also filled with the deadly toxin to a Republican senator.
A look at the day's political happenings, including the release of a post-9/11 torture report that lays the blame squarely at the feet of the nation's highest officeholders and the unveiling of a bipartisan agreement on immigration reform.
Swiss, French and Russian scientists will conduct tests on samples taken from the body of Yasser Arafat, the first Palestinian Authority president whose official cause of death eight years ago is listed as stroke, but whose personal items were found to contain traces of polonium-210.
A Swiss medical laboratory has found traces of polonium, a rare, highly radioactive metal, in the former Palestinian leader's personal effects. Is that what killed the Nobel laureate?
Last month, the investigative journalism nonprofit ProPublica published a report that highlights how dangerously little scientists and government officials know about the health consequences of living near a natural gas drilling site.