That will be deemed a step too far for now, so instead there will be moves towards exchanging information on visas and an emphasis on greater co-operation between frontier police.

ECONOMIST: Huddled masses: stay out | The

Police officer Amjad Khan told the Associated Press the blast hit a platoon of 43 Frontier Constabulary troops in a truck near the police district headquarters.

CNN: Suicide blast kills 24 in Pakistan

First, they will ponder the idea of an EU border-police to replace national frontier controls.

ECONOMIST: Huddled masses: stay out | The

Yet as Hassan Abbas, a former Pakistani police chief in the Northwest Frontier Region of Pakistan wrote in a recent paper for the Jamestown Foundation, it is unclear how US development assistance can be credibly put to good use.

CENTERFORSECURITYPOLICY: Pakistani nightmare

The victims comprised of an assistant police sub-inspector and three members of the Frontier Corps, a paramilitary force which uses recruits from Pakistan's tribal areas and is overseen by Pakistani army officers.

CNN: Suicide attack kills 4 in Pakistan

This has involved sending 180 extra federal police, to strengthen patrols along the 1, 600km Colombia-Brazil frontier.

ECONOMIST: Colombia and its neighbours

Attorney Hanni Fakhoury of the Electronic Frontier Foundation, which advocates for online free speech and privacy rights, said the data amassed by police from surveillance cameras and personal devices has enormous crime-solving potential.

WSJ: Bombing probe highlights expansion of surveillance