A police officer and two members of the public suffered minor injuries during the disorder.
Fifteen people have been arrested after violent clashes outside a Merseyside hotel accommodating asylum seekers.
A police officer and two members of the public suffered minor injuries during the disorder in Knowsley on Friday night.
Merseyside Police said missiles including lit fireworks were thrown at officers and a police van set alight.
Thirteen men and two women, aged between 13 and 54, have been arrested on suspicion of violent disorder.
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