Residents in Saudi Arabia's capital say they have heard new explosions in Riyadh.The residents spoke on condition of anonymity for their safety. One lives in northern Riyadh, where King Khalid International Airport is located.

The source of explosions wasn't immediately clear. The Saudi civil defence reported air raid alerts in Riyadh and Kharj province southeast of the capital. Kharj is home to the state-owned Military Industries Corporation and Prince Sultan Air Base.