The Irish and US governments have signed an agreement to co-operate more to tackle terrorism, drug trafficking, organised crime and fraud.

The US Ambassador, James C Kenny, and the Minister for Justice, Michael McDowell, signed agreements at the US Embassy in south Dublin this morning on mutual legal assistance and extradition.

The agreements allow for the establishment of joint investigation teams made up of gardaí and US police and the use of video conferencing for taking witness statements.

It will also allow greater monitoring and searches of bank accounts in Ireland and in the US and for information to be exchanged.