Police are unclear about what exactly happened
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Humberside Police say a petrol bomb attack in Hull on 24 December was racially motivated.
Two of the victims were of Bangladeshi origin.
Three men were loading a van with furniture on Hessle Road at about 1700 GMT when two molotov cocktails were thrown into the back of the van.
One exploded, showering one of the men's legs with burning fuel.
Police said two of the victims were then assaulted as they tried to restrain
the attackers.
Inspector Steven Dalrymple from Humberside Police says the incident has sickened officers in the force.
The two attackers are described as white, aged in their late 20s or early 30s,
of medium build and clean shaven.
Anyone with any information about the attack is urged to contact police.