Saudi police patrol Riyadh ahead of demonstrations

Hundreds of police have been deployed in the Saudi capital, Riyadh, ahead of anti-government rallies planned for after Friday prayers. Security forces have blocked roads and set up checkpoints, while reports suggest some protesters have begun to gather in the eastern town of Hofuf. On Thursday, police opened fire at a rally in the eastern city of Qatif, with at least one person being injured. Analysts have warned that any violence could have a big impact on global oil prices.