We therefore suggest that extra vigilance is observed during this time.

The question is whether extra vigilance might have turned up an opportunity to disrupt the plot.

Police say extra vigilance has helped to kerb the recent spate of attacks on horses.

"Had we not best assume extra vigilance if those subhumans are in the region?"

The leaner nature of pork these days requires extra vigilance so as not to dry it out.

In the past all drivers were expected to drive with their lights on all day long to demonstrate extra vigilance over children's safety.

"That means extra vigilance on the point and along the right flank."

But travel to a developing country where hepatitis is prevalent calls for extra vigilance.

It is important that we exercise extra vigilance in terms of fulfilling our duty.

I do recognise the need for extra vigilance about all expenditure during that period.