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At least four people are reported to have been killed in a suicide bombing at a Shia mosque in Saudi Arabia's Eastern Province, the BBC reports.

One witness told Reuters news agency there was a huge explosion at the Imam Ali mosque in the village of al-Qadeeh, in Qatif governorate.

Several people were injured in the blast.

Incidents of this kind in the Eastern Province are rare. There has so far been no claim of responsibility.

Television pictures on Lebanon's Hezbollah-run al-Manar network showed shattered glass and debris next to the tiled pillars inside the mosque, where scores were said to have been praying.

Bodies covered in sheets could be seen laid out on the floor, while injured people in bloodstained clothes were rushed out on stretchers.

Qatif hospital issued an urgent call for blood donations after the attack and called in off-duty staff to cope with the high number of casualties, a source told AFP news agency.