11.   Nevada gaming regulators say the betting ban originally was imposed to prevent Nevada sports bettors from having an unfair advantage when wagering on home-state teams.

12.   No reason was given for the measure, but it was likely imposed to prevent anti-Arab attacks while Israel remained in shock over the death of its leader.

13.   Slaughterhouse regulations were imposed to prevent infected meat reaching dinner tables, but the public was repeatedly assured beef was safe to eat.

14.   That closure had been imposed to prevent suicide attacks.

15.   The ban was imposed to prevent beef from Britain making its way back to Europe via non-EU countries.

16.   The ban was imposed to prevent the rebels from acquiring these items.

17.   The closure was imposed to prevent attacks on Israelis toward the end of the Muslim fasting month of Ramadan, a time of increased religious fervor.

18.   The closure was imposed to prevent attacks on Israelis toward the end of the Muslim fasting month of Ramadan.

19.   The closure, in effect until Sunday morning, was imposed to prevent possible attacks in Israel by the militant Hamas and Islamic Jihad groups.

20.   The order had been imposed to prevent violence after balloting ended on Wednesday.