Clashes between rival supporters, who used firearms and indulged in brick-batting, were reported from Mordabad district, Kannauj and Shahjahanpur districts. In some districts, polls were cancelled over reports of booth capturing and snatching of ballot boxes.
While a 28-year-old man was shot dead near a polling booth in Gadia village in Kannauj district, some people fired at supporters of a rival candidate killing two in Ahrolla Mafi village near Moradabad.
According to the police, those killed near Moradabad were relatives of the candidate.
A police jeep was set on fire in Akbarpur area in Ramabai Nagar. In Nayapur village in Agra, a former village head and three others were arrested after they opened fire and set afire a polling booth.
Polling in Farukkhabad, Allahabad, Auraiya, Sitapur, Lucknow, Gorakhpur among other places saw booth capturing and other incidents.
80 per cent polling was recorded in the violence-marred first phase polling of the 3-tier elections.
State Election Commission confirmed that polling was cancelled at some places on complaints. Fresh dates will be announced later.