Two of the clashes took place over incidents of alleged eve-teasing.
Thirteen people were injured in a clash between two groups at Hashimpura village in Muzaffarnagar district.
SHO A K Mishra said two persons, Mehtab and Ashu, were confronted by a group over alleged harassment of a woman which led to a violent clash in which sharp weapons and stones were used.
The injured were admitted to a hospital, he said.
Security has been tightened in the village after the incident.
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The clash occurred when one Babu objected to the harassment of a woman by miscreants leading to a violent clash, the police said.
The police then rushed to the spot and brought the situation under control. The injured were admitted to a hospital.
In the third incident, six people sustained knife injuries in a clash which occurred after dirty water was allegedly thrown on a child at Karoli village in Muzaffarnagar, SHO Anil Kumar said.
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