DUBAI (Reuters) - The assailants who attacked a state security building northwest of Riyadh on Sunday are Saudi militants who belong to Islamic State, Saudi-owned Arabiya TV said in a tweet, citing its own correspondent.

Saudi state media said authorities thwarted the attack by four militants targeting the Mabaheth (domestic intelligence) station in Zulfi, a small city about 250 km (155 miles) northwest of the capital Riyadh.

There has been no Islamic State claim of responsibility for the attack so far, and the authorities did not officially identify the assailants.