Saudi Shiite protesters chant slogans during a protest in Qatif, Saudi Arabia on March 10, 2011. (File photo: AP) 

Six suspects wanted over unrest in Saudi Arabia's Shiite minority stronghold of Qatif were killed in a police raid this week, the kingdom's secret service said Wednesday.

One person was arrested in the "preemptive" raid on a house in the eastern town of Jish on Monday, according to a statement carried by the official Saudi Press Agency.