Saudi officials say two al-Qaida militants trapped inside an intelligence ministry building blew themselves up Saturday after being surrounded by security forces.
The militants were part of a group of six al-Qaida extremists who attacked the Wadia border crossing with Yemen Friday.
Saudi officials say police killed three of the militants and a third was wounded and arrested.
At least three security officers were killed.
Two militants escaped and barricaded themselves in an intelligence building in Sharurah, firing at security forces before blowing themselves up.
Saudi Arabia is building a tall fence along its southern border with Yemen to help stop terrorists and arms smugglers.
Some information for this report comes from AFP and Reuters.