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

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

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

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

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