"They aren't supposed to be shooting anything down," said a senior United Nations official of the enforcement operation.

But differences have arisen between the United States and France over exactly how this enforcement operation should be carried out.

They patrol the park and perform various enforcement operations.

In 2004 there were 1,600 enforcement operations against illegal workers, a 360% increase on the previous year, which detected 3,330 people working illegally.

In today's world, war and military practice is either a very precise engineering-based skill or a law enforcement operation.

The general has described the September attack as an enforcement operation that went awry.

It routinely organizes enforcement operations to unearth evasion of duty and taxes.

New technology has, however, expanded the range of military and law enforcement operations.

"I also continue to have reservations about the present ability of the United Nations to undertake an enforcement operation of this nature," he said.

The most important thing is to tackle the issue, hence why we have stepped up our plain clothes enforcement operations.