Nineteen people, including 12 Pakistani nationals, have been arrested in Saudi Arabia following suicide attacks on Monday, including one near Islam's second-holiest site in the city of Medina, the kingdom's Interior Ministry said on Thursday.

A spokesperson said in a statement that authorities had also identified the suicide attackers who struck in Medina, at a Shiite mosque in Qatif and in western Jeddah, the economic capital, not far from the US consulate.