"I have come to know that there were a few incidents of misbehaviour towards Kashmiris in some places. I appeal to all the chief ministers to ensure security of Kashmiris in their states.
"I appeal to everyone to consider the Kashmiri youths as their own brethren and treat them well," Home Minister Rajnath Singh told reporters in New Delhi.
The home minister said an advisory is being sent by his ministry to all the states for the safety and security of Kashmiris living there.
Police have registered an FIR against Amir Jani, the leader of the Hindu right group Uttar Pradesh Nav Nirman Sena for putting up the posters in several places in the city.
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The poster has a picture of masked protesters hurling stones in Kashmir and a warning "Kashmiris, quit Uttar Pradesh or else...". It also calls for a boycott of Kashmiris pelting the Indian army personnel with stones.
Jani said the banners and hoardings were put along the Partapur bypass outside the colleges where Kashmiri students study.
The SHO of Partapur police station Dinesh Sharma said the banners have been pulled down.
Sub-Inspector Vipin Kumar said an FIR has been registered under IPC sections related to promoting or attempting to promote disharmony on the grounds of religion, race, place of birth, residence, language, caste or community.
Reports from Rajasthan said tension prevailed in Chittorgarh on Wednesday when a group of locals clashed with Kashmiri students of Mewar university. The clash occurred after the locals allegedly called Kashmiri students "stone pelters" and taunted them over a video showing CRPF personnel being heckled and assaulted in the Kashmir valley.