Shi'ite protesters carry posters of Sheikh Nimr al-Nimr during a demonstration outside the Saudi embassy in Sanaa October 18, 2014. The cleric was executed Jan. 2. REUTERS/Khaled Abdullah

Attack on Saudi Shiite mosque kills four

DUBAI — Security forces prevented two suicide bombers from entering the mosque, where one blew himself up, killing four. Security forces exchanged fire with the second man and arrested him.