21.   Increased vigilance by the navy and coast guard of both nations makes that difficult now.

22.   Increased vigilance over tax payments has produced a near doubling of the number of businesses paying value-added tax, van Heerden said.

23.   Police increased vigilance at airports and harbors, and appealed to the public for tips that might lead to the apprehension of the gunman.

24.   The camp bunker was also being reinforced Sunday and there was increased vigilance around the camp.

25.   The Nippon Foundation said that despite an increased vigilance by ship-owners, many Japanese vessels are still unprepared for a pirate attack.

26.   There is increased vigilance around the camp.

27.   We have increased vigilance on our borders.

28.   Victor Inaculo, the police commander of the Angolan province neighboring the Republic of Congo, also announced increased vigilance.

29.   But the increased vigilance comes as several sensitive events converged.

30.   Previously gold was smuggled in small fishing boats and Arab dhows, but increased coastal vigilance has led smugglers to change their methods, he said.