21.   Authorities tightened security around New York City landmarks after the FBI warned of uncorroborated information from detainees that sites such as the Statue of Liberty might be attacked.

22.   Authorities tightened traffic regulations and imposed higher penalties including jail terms for violators as well as stringent licensing.

23.   Authorities already had tightened airport security between France and Algeria in the past two months, with double identity checks and tougher baggage searches.

24.   Authorities have tightened border controls to meet the requirements of the European Union, which lifted visa requirements for Bulgarians last May.

25.   Authorities already have tightened airport security in the past two months, requiring double identity checks and more thorough baggage searches.

26.   Authorities have tightened controls on explosives, but they are widely available for construction, mining and fireworks manufacturing.

27.   Authorities tightened security at the base Thursday night to prepare for prisoners, declining to discuss details.

28.   Authorities tightened their massive security clamp on Ayodhya amid fears that a dispute over an ancient holy site could lead to deaths.

29.   Belgian authorities are tightening security ahead of the trial next week of suspected members of a radical Islamic group waging guerrilla war against the Algerian government.

30.   Both Haitian and Dominican authorities tightened security along their common border but the border remained open.