(BBC) The US has admitted something went tragically wrong when 11 Iraqis died in a shooting involving a US private security contractor earlier this month.
The Deputy Secretary of State, John Negroponte, said his department was now reviewing security arrangements for its staff in Iraq following the incident.
The Pentagon is also carrying out an investigation into contractors in Iraq.
The firm under suspicion, Blackwater , has said its guards reacted lawfully to an attack on a US diplomatic convoy.
Earlier, Iraqi ministers said they were still determined to press ahead with legislation that would strip foreign security personnel of their immunity from prosecution under Iraqi law.