Yemen President Ali Abdullah Saleh has called for the arrest of Sheikh Sadiq al-Ahmar, who is leading as many as 10,000 armed men from Yemen's most powerful tribal confederation.
• A daily summary of global reports on security issues. This article was updated at 8:53 a.m.
Yemen President Ali Abdullah Saleh ordered the arrest Thursday of Sheikh Sadiq al-Ahmar, the leader of Yemen's most powerful tribal confederation. The move could escalate already serious clashes in Sanaa between security forces loyal to Saleh and thousands of armed tribal fighters, potentially igniting civil war.
Fighters loyal to President Saleh and Mr. Ahmar clashed overnight Wednesday in the capital Sanaa, leaving dozens dead, according to Al Jazeera. The fighting has raged since Monday, after yet another deal for Saleh to step down failed. An ammunition store belonging to Mr. Ahmar's fighters exploded Wednesday night, killing 28, Agence France-Presse reports.
IN PICTURES: Yemen protests
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