Clashes between Yemeni government troops and a renegade army unit killed at least 20 people, including three civilians, in the capital Sanaa, officials said.

Violence threatened a return to chaos in Yemen today with at least six people killed after a day of jubilation over the departure of President Ali Abdullah Saleh.

Government forces and tribal fighters exchanged gun and artillery fire in Yemen’s capital Sanaa this morning in fresh fighting that killed at least 41 people.