21.   But a series of strong eruptions that began Monday prompted authorities to order the evacuation of the southern half of this British Caribbean colony.

22.   But a series of strong ventings of noxious gases and ash that began Monday prompted authorities to order the evacuation of the southern half of the British Caribbean colony.

23.   But the magnitude of the death and damage caused by the storm prompted Algerian authorities to call for outside help.

24.   But violence prompted authorities to quickly reimpose the restrictions and force the people back into their homes.

25.   But the magnitude of the destruction caused by the storm prompted Algerian authorities to call for outside help.

26.   Chunks of the highway from Sevastopol to Yalta have broken off and plunged down an incline, preventing trucks from passing and prompting the authorities to close the road.

27.   Complaints from local businessmen in Piedras Negras prompted local authorities into action.

28.   Drought prompted authorities in the Johannesburg area Thursday to issue restrictions on water use.

29.   Ethnic tensions had prompted authorities to cancel polling in a number of towns and villages in oil-rich southwestern Nigeria, including some villages around Warri.

30.   Ethnic violence between at least four groups has increased dramatically in recent months, prompting Zairian authorities to send additional troops to the province.