According to a statement read on Saudi television Friday, Saudi security forces were following a group that was "preparing for a terrorist act," and they have seized explosives, rifles, and rocket-propelled grenades from two locations in Riyadh.

Saudi officials did not immediately give details about who they have arrested, but said they are still looking for seven members of the alleged terrorist cell.

On Thursday, five Saudi security agents and one civilian were killed during a raid in eastern Riyadh. Agents following a tip that a suspected terrorist may be hiding in a house there, uncovered a cache of weapons and arrested several suspects.