Dehradun, Oct 1 (PTI) Tension gripped Dehradun's Patel Nagar area after an alleged derogatory social media post against Prophet Mohammad triggered protests, prompting police to carry out a flag march.

Police said the people were asked to maintain peace and cautioned against any attempts to disrupt communal harmony. The situation in the area since Tuesday night when people hit the streets is tense but under control, they said.

According to officials, a screenshot allegedly containing derogatory comments about Prophet Muhammad was posted on social media on Monday by 19-year-old Gulshan Singh, a resident of Patel Nagar, originally from Uttar Pradesh's Hardoi district.

Pramod Shah, in-charge of the Bazaar police post in Patel Nagar, registered a case against the youth under Sections 196-1 (

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