At least six people have been killed and more than 100 wounded in a series of bomb attacks in Cairo.

An explosion thought to have been caused by a car bomb killed at least five. The blast left a huge crater near the police building, the Cairo Security Directorate, and damaged several other buildings in the vicinity.

Another person died when a bomb went off near the Behooth subway station.

Fierce clashes broke out between supporters of deposed Islamist president Mohamed Morsi and Egyptian security forces, on the road that leads to the pyramids of Giza.

Morsi supporters burned tyres and hurled petrol bombs at security forces, who retaliated with teargas.

The bombings occurred on the of the third anniversary of the Egyptian uprising which ousted former dictator Hosni Mubarak.

bomb crater
A police officer inspects a crater made by the blast in front of the Cairo Security Directorate building, which includes police and state securityReuters
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Women react after an explosion at the Egyptian police headquarters in Cairo.AP
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A shoe, believed to belong to a victim, lies at the site of the blast.AP
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Egyptians look at a destroyed taxi after an explosion at the Egyptian police headquarters in Cairo.AP
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Blood is seen in the destroyed car in front of the damaged Cairo Security Directorate building.Reuters
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People carry the body of a man killed in the explosion in front of the police building in Cairo.Reuters
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A man helps an injured civilian at a hospital near the site of the explosion.Reuters
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A policeman stands guard after a car bomb attack at the Egyptian police headquarters in Cairo.AP
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A police officer holds his weapon in front of the damaged Cairo Security Directorate building, after a suicide bomber in a car blew himself up in the car park.Reuters
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Policemen surround Egypt's Interior Minister Mohamed Ibrahim as he visits the site of the bomb attackReuters
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Shocked police officers sit on the street after a blast at the Egyptian police headquarters in downtown CairoAP