A posting on a Twitter account known to belong to the Islamic State group claims the explosion was work of a suicide bomber wearing an explosive belt.
The attack was claimed by an affiliate of the Islamic State group calling itself the Najd Province, the same group that claimed responsibility for a pair of attacks on two Shiite mosques in Saudi Arabia in recent weeks.
Mohammed al-Faili, 32, told The Associated Press that his 70 year-old father was killed in what appeared to be a bombing attack.
