The footage showed social media from Medina car on fire in the parking lot, with two security officers lying nearby.
The footage showed other ambulances and police cars streaming into the region.
Some reports say the security men are about to break their fast when young Okaz said to be 18 years old, approached her to share food. And then he detonated his explosives.
No one said they were behind the attacks.
They come with the holy month of Ramadan comes to a close and before the Eid al-Fitr holiday.
And Saudi Arabia was the target of attacks by the so-called Islamic state over the past two years