Saudi security forces have killed three militants in heavy gunfire in the Red Sea city of Jeddah.
Witnesses reported gunfire in three areas of eastern Jeddah. In the Shola district, they said gunmen wounded a driver when they tried to hijack his car, before fleeing to a half-constructed building and opening fire on onlookers.
Police sealed off several streets while officers with loudspeakers tried to persuade the gunmen to surrender.
The violence in Jeddah followed Wednesday's suicide bombing in Riyadh that killed at least five people and ripped the front off a six-storey security headquarters.
It was the first major government target to be hit in a one-year campaign of violence blamed on supporters of Saudi-born Osama bin Laden's al-Qaeda network.
The Saudi state news agency said a security officer died of his wounds on Thursday, raising the official death toll to five, with nearly 150 hurt. Witnesses and medics said Wednesday's blast killed 10 people.
The Islamist group Al Haramain Brigades claimed responsibility for Wednesday's blast and said it followed the path of Osama bin Laden and his al-Qaeda network against the Saudi authorities.