US forces do not yet know the cause:
Withington said: "We have a fire. An ammunition holding area caught on fire. It's in our operating base in the Rasheed area of the city. The ammunition holding area contains tank and artillery rounds as well as small arms ammunition."
Two hours after the fire broke out a regular drumbeat of explosions could still be heard five kilometres [2.4 miles] away in the city centre, a barrage more intense than Baghdad's daily diet of car bombs and mortar strikes.Aljazeera 11.10.06
