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Scenes from the old city of Sanaa

Mohamed al-Sayaghi / Reuters

Sanaa is an UNESCO World Heritage site and is one of the oldest continuously inhabited cities in the world.

Mohamed al-Sayaghi / Reuters

A craftsman works outside his shop at the Souq al-Melh market in Sanaa's Old City district in Sanaa on Feb. 15.

Mohamed al-Sayaghi / Reuters

A man reads a Koran inside an old mosque in Sanaa's Old City district on Feb. 14.

Mohamed al-Sayaghi / Reuters

Men chew qat, a mild stimulant, inside a shop in Sanaa's Old City district on Feb. 15.

Mohamed al-Sayaghi / Reuters

A shoe salesman sits inside his shop at the Souq al-Melh market in Sanaa's Old City district in Sanaa.

Mohamed al-Sayaghi / Reuters

A vendor selling donkeys waits for customers in his shop at the Souq al-Melh market in Sanaa's Old City district.