Mr Dudley says BP had contracted Stirling Group, a security firm, to provide liaison between the Algerian military, police and the community, although under Algerian law, private security firms are not allowed to operate at such facilities.

CNN: Oil and gas industry reviews security

National Security Adviser James Jones has already described the 21st century as the liaison century, where intelligence and security services cooperate energetically.

WSJ: Reuel Marc Gerecht: The Meaning of al Qaeda's Double Agent

Perhaps some evidence will emerge that his relationship with a mole in the Home Office, who leaked embarrassing material about departmental incompetence, jeopardised national security, or that the liaison was criminally corrupt.

ECONOMIST: Bagehot

When illegal behaviour is identified, there is good liaison with the police and security services.

BBC: Student lecture

Charles Brooks, Director of Congressional Liaison, Department of Homeland Security, former legislative assistant to Senator Arlen Specter.

CENTERFORSECURITYPOLICY: Center For Security Policy

The UK Department for Transport said a small number of staff from the U.S. Transportation Security Administration would be based at certain British airports "to act as an on-site liaison for the TSA." The TSA staffers will not, however, be conducting security screening or inspections, the Department for Transport said.

CNN: London's Olympic security headache

Mr. MOHAMMAD NAZIF KADRI: (Through translator) The liaison office in Irbil was supporting factions that threatened the security of Iraqi Kurdistan and the rest of Iraq.

NPR: Kurdistan Caught in Middle of Iran-U.S. Tensions