Four Shiites who "confessed" to taking part in an attack that killed three policemen in Bahrain this month could face the death penalty if convicted, prosecutors said on Sunday. Death sentences are usually commuted to life imprisonment -- 25 years -- in the Gulf kingdom, which has been rocked by a Shiite-led uprising against the Sunni Al-Khalifa dynasty since 2011. The public prosecution service has ordered Sami Mirza Ahmed Mushaima, Abbas Jamil Tahir Alsameea, Ali Mohammed Jamil Taher Alsameea and Yusuf Ahmed Mohammed Taher Alsameea "jailed on remand after being charged with establishing and joining a terrorist group... (and) killing security personnel," a statement said. The crimes could carry the death penalty and revocation of citizenship, it said.