Saudi security forces on Tuesday shot dead a member of an armed group that killed five people in an overnight attack on Shi’ite Muslims marking an important religious anniversary, al-Arabiya television reported.

The late Monday assault on a Shi’ite gathering in al-Ahsa district is likely to test already strained relations between Sunnis and Shi’ites across the Middle East because it coincided with the annual Ashoura commemoration of Shi’ite Islam.

The Dubai-based al-Arabiya said security forces who had been hunting suspects in the al-Ahsa attack clashed with and killed “a wanted man” at a rest area in the al-Qassim province, north-west of the capital Riyadh. […]