11.   Chechen and Russian police were to begin joint patrols of the borders between Chechnya and neighboring regions this month.

12.   Environmentalists have urged the government to begin air patrols over the region to deter poachers, who gun down the elephants and then sell their ivory tusks.

13.   Hundreds of international police officers began patrols on Monday.

14.   In major Indian cities where Muslims and Hindus live close together, police began extra patrols to guard against violence.

15.   In other Indian cities where Muslims and Hindus live close together, police began extra patrols to guard against violence.

16.   NATO has not yet begun night patrols for the same reason.

17.   Recently, warships and maritime reconnaissance aircraft from Singapore, Malaysia and Indonesia have begun joint patrols of the seaway.

18.   The dispute prompted American troops of the NATO-led peacekeeping force to begin regular patrols in the area as of Monday.

19.   The dispute prompted American troops of the NATO-led peacekeeping force to begin regular patrols in the area on Monday.

20.   The U.S. and some allies begin air patrols.