So far, only Sky News has this. Assiduous searches elsewhere turned up only a BREAKING NEWS alert about actor Tony Randall’s death.
More details when available.
UPDATE: According to AFP, none of the four included Abu Mussab al-Zarqawi, who US authorities believe carried out the killing.
Four people have been arrested over the beheading of American Nicholas Berg, Iraq sources say.
The 26-year-old businessman’s decapitated body was found 10 days ago in Baghdad.
UPDATE: AFP has more.