Photos on social media show smoke billowing from a fire outside the mosque where Prophet Muhammad is buried.

The cause of the explosion on Monday evening was not immediately known. Some reports suggested it was a suicide bombing, while others said a gas cylinder had blown up.

Qari Ziyaad Patel, 36, from South Africa, was at the mosque when he heard a blast just as the call to sunset prayers was ending.

Many at first thought it was the sound of traditional, celebratory cannon fire, but then he felt the ground shake.

"The vibrations were very strong," he told the AP news agency. "It sounded like a building imploded."

The blasts occurred just before the Maghreb (sunset) prayers when people were breaking their fast inside the mosque.

Qatif explosions

Around the same time, two other explosions struck near a mosque in the eastern city of Qatif on the Gulf coast, residents said.

Witnesses said a suicide bomber blew himself up outside a Shia mosque without causing any other injuries.

They reported seeing body parts lying on the ground in the city`s business district.

"Suicide bomber for sure. I can see the body" which was blasted to pieces, a resident told the AFP news agency.

Nasima al-Sada, another resident, said "one bomber blew himself up near the mosque".

A third witness told Reuters news agency that one explosion destroyed a car parked near the mosque, followed by another explosion just before 7pm local time.

"We are in the last 10 days of Ramadan and those places are crowded because of that for Maghreb [sunset] prayers," Khaled Batarfi, a Saudi Gazette columnist, told Al Jazeera.

There was no claim of responsibility for the attack.



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Two explosions shook the city of Qatif in eastern Saudi Arabia, where many of the kingdom`s Shi`ite Muslim minority live, and witnesses said body parts could be seen in the area of the blast.

A witness said one explosion destroyed a car parked near a mosque, followed by another explosion just before 7 p.m. local time. Body parts could be seen and they are believed to be that of an attacker, the witness added.

Photographs purporting to be of the incident published on Twitter showed a severed leg and crowds gathered outside a mosque at dusk. Some posts said the explosion was caused by a suicide attacker setting off a bomb.

Reuters could not immediately verify the images or confirm the information.

The incident happened just hours after a suicide bomber was killed and two people were wounded in a blast near the U.S. consulate in the kingdom`s second city of Jeddah on Monday.

It was the first bombing in years to attempt to target foreigners in the kingdom. There was no immedaite claim of responsibility for the Jeddah attack.

Islamic State has carried out a series of bombing and shooting attacks in Saudi Arabia since mid-2014 that have killed scores of people, mostly members of the Shi`ite Muslim minority and security services.

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