A Houthi follower in Sanaa on December 3, 2017 as the rebels' alliance with ex-president Ali Abdullah Saleh continues to come apart. Yahya Arhab / EPA
A Houthi follower in Sanaa on December 3, 2017 as the rebels' alliance with ex-president Ali Abdullah Saleh continues to come apart. Yahya Arhab / EPA

Sanaa 'paralysed' in rebel-alliance clashes