Authorities in Guatemala say seven people, including policeofficers, have been arrested in the killing of a prominent lawyer whoaccused President Alvaro Colom of involvement in his death in aposthumously released video.

The announcement was made Friday bya special United Nations panel (known as the International CommissionAgainst Impunity in Guatemala) that has been investigating RodrigoRosenberg's death.  The panel was set up two years ago to probecorruption in the Central American country.

Rosenberg was shot dead four months ago while riding his bicycle in Guatemala City.

Inthe 18-minute recording that surfaced after his death, Rosenberg saidofficials might want to kill him because he represented a businessman,Khalil Musa, who was murdered in March, along with the man's daughter(Marjorie). Rosenberg said his client refused to participate in acts ofcorruption purportedly involving a local bank.

President Colom went on national television to dismiss the accusation and demand an outside investigation.  

Thevideotape also accused Mr. Colom's private secretary, Gustavo Alejos,of orchestrating Rosenberg's murder and alleged the president's wife,Sandra, was involved as well.  The case prompted calls for thepresident to step down.

President Colom took office in January of last year.